A Puffer by any other name would smell...
Hi!
<Hi, Trish... Anthony Calfo here answering Bob's mail while he is away on a fantasy fish collecting trip, as we are told, wearing nothing but a natural bikini made from the hide of a capybara that he caught himself, and armed only with a buck knife clenched between his teeth>
I recently bought 4 baby puffers - the spotted green kind.
<AKA: Green Puffer, Spotted Puffer, Leopard Puffer, etc.>  However, different websites seem to give it different Scientific names. Some say it's TETRAODON FLUVIATILIS, others say it's TETRAODON NIGROVIRIDIS.
<I'm not certain...Bob can confirm, but it is my understanding that they are one in the same and that T. nigroviridis is the valid name>
The pictures of both species on the internet look the same so I can't tell which species mine is. My puffers have an iridescent green background with round spots. What is the difference between Tetraodon fluviatilis and Tetraodon nigroviridis? Would really appreciate it if you can clear up my confusion...Thanks, Trish
<I'll borrow your confusion and add it to my own cerebral clutter... best of luck to you, Anthony> <Are two, separate species... please see Fishbase.org re. RMF>

Picked a Peck of Pimpled Puffers (marine, but applicable to FW puffers as well)
Mr. Fenner,
<Geri...Anthony Calfo here answering Bob's mail while he is away studying to become a Tibetan Sherpa>
I have 3 small green spotted puffers in a 30 gal brackish tank. 
<adorable fish... you are keeping them brackish, right? what's your salinity?>
They are all eating well and are very lively. I have had them about two weeks and two of them have developed small bumps (no discoloration-just raised areas) under their skin. The bumps were first noticed on their bellies and now one fish has a couple on his side. I need help in determining what these bumps are and if I need to treat them. Please reply-Thanks for the advice.
<tough to diagnose from a general description of the symptom, but here goes: if the bumps/dots are symmetrical and identical in size... and not larger than a common grain of salt (as opposed to an uncommon 5lb grain...in which case you can forget the quarantine tank and just find a small deer to lick it off, hehehe) you may very well be dealing with an external parasite. Not at all uncommon with this species and not as obvious to you compared to pictures of large-scaled fishes in books. You must be very careful using medication with these fish and follow manufacturer's recommendations for scaleless fishes (or halve the dose for twice the time). Otherwise, large or asymmetrical bumps will rule out most if not all common parasites and you'll look for other pathogenic symptoms. I would highly recommend Dieter Untergasser's Handbook of Fish Diseases. A great and easy to understand book with pictures and fool-proof flow charts. We need to narrow the puffers condition down before we medicate. In the meantime... look for medicated fish food at the LFS and maintain consistent water quality. I'm (educated) guessing that your fish have common white spot and will need a parasite medication. Keep us posted, Anthony>

Pufferfish (again!)
Hi Bob,
Please accept my apologies for burdening you with yet another pufferfish
question!
<Okay>
I recently obtained an attractive 30 UK gal tank as a gift and I have chosen
to be boring and fill it with brackish puffers as with all my other tanks! 
<Nice gift>
I have heard from various sources that keeping two puffers together results in
one being dominant and bullying the other to death whereas keeping them in a
small group would ease the one on one bullying as it has in my 150gal puffer
tank. My proposed stocking ideas for my 30 gal is either two figure eights
puffers or one green spotted puffer on its own (or if I have any luck, a
Ceylon Puffer!)
Would it be wiser for me to add 3 figure of eights so its more of a group? 
<Yes>
Or would it be better to go for just one larger fish such as a Green Spotted
rather than keeping several Figure of eights together in a small tank?
Many thanks for your advice once again,
<Worth trying the group first. Do keep an eye out, perhaps a phone call in to suppliers for "oddball" puffers in their imported shipments... from Africa, Asia... there are very often "contaminants"... not-listed species mixed in... Bob Fenner>
Kris

Tetraodon suvattii
Hi, I recently purchased a pig-nosed puffer (Tetraodon suvattii). Every website I visit that does have info about her (there are very few) is contradictory. Some say they're harmless to larger fish, & some are saying they'll kill everything in my tank. 
<Mmm, both are factual statements... some specimens, some situations, the larger freshwater Tetraodons "get along"... and, in others, become true terrors>
Some people are telling me they're sedentary, & some say they should be in the top 3 of the most aggressive puffers. I was told at the shop where it was purchased that they are from completely freshwater, no salt is necessary. 
<This may be so>
There was a FW snowflake eel (Echidna rhodochilus) in the tank with the puffer at the shop, & I bought it too. Now it has a mucus-like whitish slime on its skin. I am slowly adding brackish salt to the tank, but I don't know how much this puffer can tolerate. I also have a yellow-tailed Chalceus & a parrotfish
<Maybe what is otherwise called a "Parrot Cichlid">
in there. Thanks ahead for your advice, Jeni
<Please take a look on our site re these fishes. The "Not" Freshwater Morays: http://www.wetwebmedia.com/fwmorayeels.htm
and Chalceus on the characiform fishes areas. Bob Fenner>

Colomesus psittacus
I have a 75 gallon freshwater tank with the following fish: 5 green barbs, 2
Bala shark, 3 dwarf Gourami, and 2 Suckermouth cats. I just bought 3
Colomesus psittacus which the aquarium store said were compatible with my
set up and would only grow to 4-6". (tank has small pebble base, lots of
plants, large rock formations and driftwood.) The information I have been
able to find on this fish is conflicting. Are they freshwater or brackish?
<Actually kind of both... found along Atlantic coast and inland waters... please see here on fishbase.org: http://www.fishbase.org/Summary/SpeciesSummary.cfm?ID=
and the Freshwater Puffer FAQs on our site here: http://www.wetwebmedia.com/fwpufferfaqs.htm>
Will they become aggressive? They are fairly peaceful now. I don't want to
have these little guys either get hurt, or hurt my other fish. Thanks,
Happy Holidays, Elizabeth
<I've had good luck with this species leaving most everything else alone (unlike so many other freshwater to brackish puffers), and all but your Gouramis are fast, smart enough to stay/get out of their way. I would just keep them fed (meaty foods daily) and keep an eye on them. Be chatting. Bob Fenner>

Figure Eight Puffer Fry
Hello again Mr. Fenner,
I hope you are doing well. I am writing to seek some
advice about one of my quarantine inhabitants. I want
you to know I have done all of the research I could
get my hands on, and have exhausted all of my
theories. I am getting somewhat desperate here.
<Let's jar your memory, give you a bit more to cogitate furiously with>
On October 24th I received a call from my LFS about a
nasty torn finned Figure Eight Puffer (Tetraodon
biocellatus) they needed help with. I have little
experience with fresh to brackish water fish, but was
happy to see what was the matter. I went down there
that day to see the puffer. The staff expressed to me
that they felt the puffer was pregnant. How they came
to that conclusion I do not know. :) I had no reason
to doubt their concern, so I told them I would take
her home and see what happens.
She was about 2 1/2 -3" in length and beyond the norm
for puffer chubbiness. It's fins were torn quite badly
(I am convinced it was shipped and bagged with others
of it's species) 
<Common, and common result>
but she ate well and adapted to my QT
tank without incident.
On November 2ed almost over night, her belly darkened
and had 2 distinct lumps. One below it's mouth and
1/4" below that, a much larger darker swell. I did all
of the research (asked on WWF and Ananda was quite
helpful)
<As I've seen>
I could, and honestly became convinced it
could not be a pregnancy. Bloat? Naww.. she swam around
like she owned the tank and ate like a mad fiend.
Five days ago I awoke to go start my morning tank
chores to find one very FAT mama puffer and 5 little
babies hiding behind a banana leaf plant. I put the
puff fry in my nursery tank and proceeded to freak out
at how large mama was. Calmed down some and guessed
she ate the rest of the family. :)
<...! Are you sure these are puffer babies? All tetraodontiform fishes are oviparous... not livebearers... Takes two to tango, with pelagic period...>
I have tried everything under the sun to get these
little fry to eat. I am down to 3 fry now. They are
about 1/2 the size of an eraser on a # 2 pencil. So
cute they will drive a person crazy. I have tried
newly hatch brine, and Mysis, slurry of all sorts of
ingredients, baby snails and SMALL pods from my
refugium are all that seem to sustain them. Now they
seem to have lost interest in that and are rather
lifeless. I think another puff fry is going to be lost
today because it is bottom dwelling and looking rather
sad. I add a low dose of vitamin supplements to their
water as well.
Water quality for the fry and mama are all good.
Ammonia, Nitrite & Nitrate 0, temp a balmy 80*, soft
water flow. 2 of the three do look somewhat active,
but how to stimulate their appetite is at this point
unknown to me.
Any suggestions are beyond welcome!
<Live baby brine shrimp... which you can hatch out... but for now which you can have your LFS strain out (with a fine mesh, usually white in color, net under their larger net...)
Now about mama. She is looking to have signs of bloat
now. She will not eat, hardly moves. I thought I would
give a Epsom salt treatment a try, but I have a
nagging suspicion that it was birth her fry. any
trauma related to it that is causing this reaction. Is
it at all possible for infection to accrue, as I have
seen with marine fish, after birth? 
<Yes>
I always hesitate
to give any kind of chemical treatment without a firm
belief in the cause of the illness. I am not sure
about the presumptions I am making. She was fine the
day of and the day after her birth. It sounds like an
infection setting in to me.
<Which hopefully can, will solve itself with time, good general care>
Again, if you have some thoughts as to what might be
at play here for both I am all ears. I hope I gave all
of the information needed. I have the fry and mamma's
plight well documented so if you need additional
information I would be glad to supply it.
Forgive me for the long post. Hope to hear back from
you soon. I wish I could repay you for your time and
effort.
Happy Holidays
Lenore
<No worries re notions of remuneration. My "pay" is manifold in your, others involvement in life, concerns even just here, let alone the obvious good exercised else... Don't consider that there is much more to do than you have mentioned... if/when the young are a bit larger do try a glass dish on the bottom with some Tubifex/tubificid worms... Be chatting. Bob Fenner>

Re: Figure Eight Puffer Fry
Mr. Fenner,
Okay, I thought I was freaking out before, now I
think it can be called going crazy. Not puffer
babies?? ::insert hysterical laugh:: What the heck
could be going on that I could misinterpret this. I am
99.9% sure that the puffer in my QT is in fact a
figure eight. The babies are small, but I swear to you
on all that is holy that they look to be a miniature
of the puffer.
<Amazing... strange>
Good grief, not live bearers. That's great. ;) Okay,
now that I am thinking that my .1% might be a big
factor here. Could you suggest a possible other fish
(similar in appearance to the figure eight?) that I
would mistake as a puffer?
<More likely... that whatever young they are were transferred in the bag, introduced into the system in some other way... these do look like very small versions of the "parent" I trust>
I will try the baby brine once again and cross my
fingers that they will take to it.
Thank you for your obviously much needed help. :)
Lenore
<A pleasure, yet mystery for sure. Bob Fenner>

Puffer with problem
Hi,
My figure-8 puffer has a large growth on his tail just before his back fin. It looks like a blister. There is no discoloration. His appetite is fine. Antibiotics have been ineffective. What is it? How can I treat it?
<Likely some sort of subcutaneous tumor... best to ignore it... chemicals won't "treat it", surgery is more dangerous, stressful than it's worth. Good water quality, feeding... will see this animal to its best health. Bob Fenner>
Thank you,
Paul

Problems with a Figure-Eight Puffer
<<JasonC here, helping out while Bob is away diving.>>
Bob Fenner Hello I recently sent this message to the folks at PufferNet and they said to send my message to you. <<really.>> I just copied what I sent them put it on the bottom of this letter. The only thing new with my puffer is the worm looking thing in his eye was there one morning and when I got back from my run it looks like it popped out. <<hmm...>> My puffers eye is almost back to normal <<glad to hear this.>> but I worry that if it was a parasite he may have eaten again because I saw it nowhere in the tank. <<may have gone into the substrate.>> and he is always on lookout for food. <<sounds good.>> He also still has a bump on his back it doesn't look like it has moved to much. Again thank you for your time and any suggestions on what to do would be a great help. thank you
Ed Purdy
<<Ed, it sounds like you should probably take actions with copper or other similar mechanism that would kill those evil-nasties. I would suggest you read through the following FAQ on WWM: http://www.wetwebmedia.com/fwpufferfaqs.htm - from what I can gather your puffer will respond well to copper and so now might be the time to use some. Cheers, J -- >>

Re: Figure Eight Puffer Concerns
>Hello I own a figure 8 pufferfish, shortly after I
>brought him home I noticed that he had a bump on his
>back. It has continued to grow and since move. I think
>he has a parasite of some sort growing under his skin
>and don't know what to do? The parasite has since
>split into two or multiplied at times it looks like
>there is a worm in his skin. I never see it move I
>just wake up and it is in a different spot. It is
>currently in his eye and I can see what looks like a
>little worm wrapped up in his eye. Please let me know
>what you think this might be and what to do to help
>the little guy out. Other wise he has a great appetite
>swims fine and acts normal. Thanks for your time.
>Ed Purdy

Re: Figure Eight Puffer Concerns
Jason,
<<Hello,>>
Thanks for the suggestions and I will check out the FAQ's on the puffers. But I am not familiar with copper. Is that copper like the metal? <<Same element as the metal, but in liquid form.>> Any way is it something that is normally carried at the pet store? <<Yes.>>
Again thank you for your time and help. I'm sure my puffer thanks you as well.
Ed
<<Ed, also check out Bob's answers to various FAQs on Copper in Marine systems. Obviously your puffer isn't a marine fish, but I think some of the information in these links will be of some use as well:
http://www.wetwebmedia.com/marparasitcurefaqs.htm
http://www.wetwebmedia.com/copperfa.htm
Hope that's helpful. Cheers, J -- >>

Spotted puffer
Hi I have a question about pufferfish. I bought a spotted puffer about 2 months ago and he acts and looks really healthy. The other day I noticed something strange, he turned a different shade. He was laying near an ornament I have and was really dark. When I looked in the tank he came swimming over to me like always and his color went back to his normal shade. A friend of mine has a spotted and a figure 8 and he said he noticed the same thing only one of his turns lighter. Is this normal? 
<Yes, normal... but one is freshwater, the other species becomes brackish to marine with age...>
Do they do this for camouflage? Or is it a mood thing?
<Both as far as I'm concerned. Bob Fenner>

Eating Problems
Hi there, I just browsed through your FAQ page and I think you may be the only one to help me. I have a common spotted puffer (the brackish variety), about 1.5in. long in a 10 gal. tank. Actually, there WERE two of them...unfortunately I fell for an undergravel filter system which, because it trapped all the waste, caused my nitrite levels to skyrocket. (strangely, the ammonia was fine) Daily water changes did nothing to alleviate the problem, probably because the readings were way off the charts. The one little fellow died as a result (I think that's what it was, anyway). Not wanting to kill another, I took the whole system out and replaced it with a canister filter (Aquaclear). The powerhead from the undergravel is still in there (with a small Quickfilter) for extra movement and hopefully so a biological filter will develop in there. 
<Yes>
The nitrite levels are fine now BUT, and here's my current problem: the fish won't eat (at least not the way he should). Even in the cruddy water, he ate like a pig, but now he just picks at his food. Furthermore, he likes to explore the tank a lot (tons of rock-caves), and every once in a while, he disappears behind the powerhead. Whenever he reappears from there, his belly is completely black. After a couple of minutes, he'll go back to a nice bright white (belly) but I am a little worried. Could he just be moody (as was suggested by the LFS)? 
<Yes, likely so>
Also, I put a java fern in there, hoping it would live, and so far it's looking pretty good (except when he tears chunks out of it). I read that it is a good idea to make plant matter available to them as food every once in a while. Does this go for all puffers?
<To some extent, yes>
My species? He seems to love it (at least he did, when he still ate...). Besides the plant, he gets a variety of silver sides, brine shrimp, salad shrimp (the little ones from the supermarket) and blood worms (all frozen) and (when I can get them form a reputable tank) live snails. He hasn't had snails lately, but he's not interested in any of the other stuff. Any ideas? 
<Likely no problem here. Some residual reaction from the nitrite poisoning... and these puffers do go on feeding strikes for no apparent reason from time to time>
Also, I'm getting conflicting info on the salinity levels: some say 0.800, others 1.005 and others again 1.020. Mine is at around 1.008-1.010. Could this be the problem?
<Could be a contributing factor... the high side I'd use is 1.010... low 1.005>
How quickly should I elevate salinity if it's too low? 
<Please read here: http://wetwebmedia.com/bracmaint.htm>
The LFS had him in water which was barely spiced. Anyway, could it be that he's still getting used to the new system? 
<Yes>
Is he, maybe lonely? 
<Not likely>
I know they're supposed to get nasty as they get older but these two seemed to play really nicely together. I plan to get him another buddy but not until I get everything straightened out perfectly. I'm still doing frequent water changes, but I test for levels first so I don't stress him unnecessarily. He gets treated with Stresscoat (when necessary) and I add Stress Zyme with every water change. Also, my pH levels are right around 7.0.
<Should be a bit higher...>
Again, I've gotten conflicting info on ideal levels, but the general consensus seems to be that it should be a little more alkaline. I didn't want to mess around with too many things at once, but could this be the solution for my problem?
<Once again, likely a contributing factor>
(If so, how quickly do I change the pH level?) Anyway, I think I've written too much but I'm hoping you can give me the info I need. Many thanks, Nina
<Do read over the WetWebMedia.com re pH/Alkalinity in freshwater systems. Bob Fenner>

Re: Puffer Eating Problems
Very grateful for the quick and helpful response. He IS eating now, just not as quickly as he should. Again, thank you very much. Nina
<Good to hear/read of the improved appetite. Should continue to do so. Bob Fenner>

Lymph on FW Puffer
Great site. My figure eight puffer has Lymphocystis I believe. 
<Very common>
They are
large clear bumps on his underbelly. I've asked several aquatics stores
what to do, but they've offered little advice. Is there something you would
recommend to treat this ailment?
<If large enough, discrete... can be carefully prised off twixt thumb and a finger nail... Salt of appropriate strength/use helps, as does lacing/soaking foods with a vitamin preparation. Please read here: 
http://www.wetwebmedia.com/lymphfaqs.htm
and the links beyond. Bob Fenner>
Joe

Where can I buy this fish? (Schoutedeni Puffer)
Do you know where I can find this fish to buy? Do you have any information on it? Books? Does it eat plants? Can I have it in a 20 gallon planted aquarium by itself?
<Have a bit on this species posted here: http://www.wetwebmedia.com/fwpuffers.htm
Can likely be special-ordered through a good sized livestock-carrying fish store... or a good etailer of same (links: http://www.wetwebmedia.com/links.htm
Not a plant eater, territorial with its own kind, so likely one to your twenty gallon system. Fine solitarily. Bob Fenner>
Thanks
David

Sick dwarf puffer
Hi, I have had a tank with 6 freshwater dwarf puffers (most about 1/2 inch) in an eclipse system 6 (6 gallon w/ charcoal/BioWheel) for about half a year now... everything has been great with no problems until the largest one (almost 1 inch long male) developed a white spot in the middle of his back about a week ago. Since then, about 8-10 of these spots have slowly developed over his back and head. These spots look larger than any ich spots that I have seen, these are about 1mm in diameter and some have turned black. There isn't any noticeable bump or depression in the skin, however. 
<Good descriptions, not likely ich... perhaps not even infectious or parasitic>
He has no other symptoms except that he has recently developed a very small white spot on his fin and brown dot on his underside, he has also started to act a bit disoriented and seems to be having a bit of trouble eating, though he tries. I removed the filter and have tried a 5 day, full strength cycle of Quick Cure (malachite green) as well as adding a little over a tablespoon of aquarium salt.
<Good choices in therapy... about what I would have tried... in addition to vitamin administration to the food, water>
I also raised the temperature from the normal 82 up to 85 and begun daily 20 percent water changes but to no avail. A couple of spots have recently begun developing on a second puffer in the same progression (from the middle of the back to the head).
Do you know what this could be and how I could treat it? Also, can I raise the temperature and salinity any more?
<Could be a microsporidean, sporozoan infestation... Worth taking a look at scrapings of the area (even histological sections if you can secure help, do this maybe through a local college...) to determine origins... I would stick to what you're doing and add a complete aqueous vitamin and iodide mix to these fish's foods daily and to the tank water weekly. Such preparations are made and labeled for ornamental aquatics use by retailers, e-tailers. You might even try (yes, this is a semi-endorsement) a "garlic" prep. in their food. Good luck, life my friend. Bob Fenner>
Thanks,
Jeremy

Sick puffer
Hi,
I recently purchased a figure 8 puffer that's about an inch and a half long.
He's currently in a 10 gallon freshwater tank with 4 painted tetras and a
ghost shrimp. He occasionally chases the shrimp, but other than that he's
left everyone alone.
<So far... Please read: http://wetwebmedia.com/fwpuffers.htm>
The tank has an Aquaclear 150 filter filled with the sponge and Ammocarb in a
bag. The heater keeps the tank at about 78 - 79 degrees and the pH is about
7.3 . I leave the light on during the day (there's a Brazilian sword plant
in the tank). The tank has cycled and I've added 2 tablespoons of Aquarium
Salt. 
<This is one of the freshwater puffers...>
He was eating fine for about a week (fed freeze dried brine shrimp and
live blackworms twice a day) but today he refused all foods at both feedings
(morning and night). He looks thinner and seems weaker (hanging out on the
bottom a lot).
Is he sick? Is there anything I can do? Any advice would be greatly
appreciated.
Thanks for your help,
Eric
<Your Puffer may well be sick... perhaps just not acclimated... I would try offering it other foods, perhaps a bit of cut shrimp, squid or crab meat. Bob Fenner>

Re: sick puffer
Thanks for the quick reply ... unfortunately I just flushed the little fella.
No idea what happened unless he wasn't well cared for at the pet store or
maybe couldn't acclimate to the new tank. Thanks anyway.
Eric
<I am hopeful that your apparently cavalier action and message here are simply my (mis)interpretation. What did Pliny the elder write, "If a man would be unkind to his parrot (and you with a psittacine e-nomen), then why not his country...". Be chatting. Bob Fenner>

Green/gold puffer
Robert, 
first off, a very informative sight.
<Where? Oh, you mean site...>
Next, a question which no one at the pet store could answer.
I bought a freshwater green/gold puffer. All was well until she (I am assuming it is a she) got sluggish. A couple of days, she was hanging on, not doing too well. However, I noticed a small bubble egg-sack with eggs inside. It was laid on the slant of a rock.
My questions are : does this sound like an egg-sack?
<Maybe, but not of a puffer>
also, does this breed lay pre-fertilized eggs? 
<No, egg scatterers, no parental care... eggs float about in the epipelagic environment...>
or does the male come 
and fertilize after? 
<They spawn (release their gametes/sex cells) into the environment after a bit of "courting-dance">
it seems that throughout the past days, the eggs are getting more white (or yolkie?)
<Likely "fungussing"... if these are eggs (from somewhere), they are "going bad", decomposers consuming them>
for now, I have removed the dead puffer and all other fish to see what happens. I have a real small tank (under 5) and want to see if they will hatch (or if they are even fertilized)
Also, how long approximately does it take from lay to hatch?
I appreciate your expertise, Glenn
<Do you have any snails in this system? Other sorts of life? Bob Fenner

Re: green/gold puffer
Robert
thank you for the response.
here is the thing...there were only two other animals in the tank. One a guppy which the sack is bigger than, and a snail smaller than half a pinky-nail....Leading me to believe that it was the puffers work.
These are the only three to have ever inhabited the tank. Now, the sack is in there alone. Any ideas?
<Hmm, think this may be that small snail, or perhaps others hiding in your substrate... Next most likely possibility, an insect (from outside the tank) using your system to reproduce... next category? Algae of different sorts that look "egg sack like"... Have you got an inexpensive microscope (up to fifty power?) or friends in a bio. lab with same? Perhaps a closer look would be revealing. Bob Fenner>

Re: green/gold puffer
I've got a microscope...ill take a look. thanks for your help.
<Ah, and likely a doctorate in invertebrate zoology! Make it known if I may be of assistance my friend. Bob Fenner>

Availability of Mbu puffers
Hi Robert, I am looking to stock a 29gal tank with some sort of puffer
(it is empty now). Can you tell me where to look for a Mbu puffer?
<Your better retailers should be able to "special order" you one. If not them, the etailers about can do so. A few of these are listed on our links pages: http://wetwebmedia.com/links.htm
And
where to find out water chemistry requirements?
<It's a bit of work, but I'd use fishbase.org: for instance, cut and paste this URL: http://www.fishbase.org/Summary/SpeciesSummary.cfm?ID=10103
for the Mbu puffer... you can insert any common or scientific name in Fishbase's search feature... it will give you habitat information for many species, references (albeit scientific) for many. Have you read through the FAQs on freshwater and brackish puffers posted on our site?: http://wetwebmedia.com/fwpufferfaqs.htm
Other people's Mbu puffer queries/my responses there>
If not this species
maybe a more available one like green spotted or Congo. Thanks for any
info you can provide.
Jesse
Durham, NC USA
<Keep studying my friend. Bob Fenner>

Tetraodon mbu
Hi,
1.What tank size for Tetraodon Mbu?
<Starting size of the fish? How long do you want to keep it... happy, healthy? A twenty to a two hundred gallon...>
2.How much swimming space?
<About the same as specified by tank dimensions above>
3.What tank mates?
<Only very aware, and or tough, mean, fast fishes... perhaps some live plants. Doubtful any invertebrates...>
4.What filter?
<Outside power and internal powerheads for added circulation, aeration>
5.Any other important information?
<Frequent partial water changes with pre-made water of high alkalinity, some salt... see here: http://www.fishbase.org/Summary/SpeciesSummary.cfm?ID=10103&g
Cut and paste URL.
A very mean fish species... best kept either in a "species tank" or a biotopic presentation with other fishes from the region (Lake Tanganyika, Congo...>
Thank you
<You're welcome. Bob Fenner>

Mbu Puffer
I am thinking on getting an Mbu puffer fish I know that it gets big but just how big does it get in the home aquaria 
<About a foot in length in a big enough system, time, food going by...>
there is all different advice like this puffer can go in with other fish depending on how the fish is but they never say which fish
<"Smart", fast, aggressive ones... best are cichlids, catfishes, Characoids from the same region the Mbu is collected. You can find this information on fishbase.org>
and also if I get one from a baby how long does it take to lets say 6 inches from say a 2inch 
<About a year to two years... depending on feedings, maintenance... Please see "Optimized Growth": http://wetwebmedia.com/optgwth.htm>
please could you email me back which some advice thank you 
<Chat with you soon my friend. Bob Fenner>

Re: availability of Mbu puffers
Thanks very much for your reply. Your website is fantastic. I will
continue my research until I am sure to treat my finned friends right.
Jesse
<Outstanding! Bob Fenner>

Pufferfish (brackish...)
Hi Bob,
Thank you so much for all the information on this website. We recently
(3 weeks ago) added a spotted green puffer fish to our established
freshwater plant and fish tank (30 gallons). He seems to be doing very
well. We feed him living and frozen brine shrimp. Just today, I
noticed that he has two small white spots on his one side. I'm very
worried about this. 
<Are they "symmetrical", as in evenly placed on both sides of the body? If so, these may be nothing more than "tubercles"... natural structural parts of the puffers body... Otherwise, you may have cause for concern... as this isn't really a freshwater fish, as you likely know, but a brackish animal... that likely has too different water quality requirements than your plants, likely your fishes as well... As in a need for hard, alkaline water with ionic/salt content: http://wetwebmedia.com/fwpuffers.htm>
From looking over your site, I think I should feed
him a more well rounded diet (addition of blood worms? 
<A good idea... a favorite food of this group, as are tubificid/black worms>
I've tried dried
plankton, he hates that), and maybe add some salt to our tank. But we
do have some plants and other fish, including Corydoras julii,
Siamensis, and albino shrimp, so I am worried about adding salt into the
system. 
<You should be... the Corydoras can take some salt, the shrimp, not much...>
The fish store supposedly has acclimated their puffer fish to
freshwater.
<Though they cannot live permanently in "very" freshwater... this species migrates in/out of the sea...>
I really love this pufferfish, so I am willing to do what
it takes to keep him healthy. Your help is greatly appreciated.
<In any length of time (months) this animal will need different water conditions. I know this is hard to come to grips with... but I'd either trade it back in, or place it in a different type of system... There are other brackish livestock, including fishes, invertebrates and plants... but what you have cannot practically be kept together. We can/should chat this over if it's not clear. Your friend in fish, Bob Fenner>
Sincerely,
Carina Howell

Figure eight puffers
HELP!
I recently got 3 figure eight puffers and was told to add half a bag of Sea Salt (1 bag does a ten gallon tank, and I have them in a 5 gallon for now) for brackish water. After careful measuring, half a bag equaled two cups of sea salt.
<I do hope you didn't add all this... unless the fish you bought were in the same specific gravity water...>
From all the reading I have done in the past few days (the more information, the more confused I get), it seems this guy at the aquarium store was on crack! THAT'S A LOAD OF SALT for a small tank that's supposed to be brackish, not MARINE ! How do I fix this (even though my little guys seem fine for now, they are eating fine, maybe just not as active as they could/should be?).
<I wouldn't change anything at this point. A good practice, especially when dealing with such small volumes is to pre-mix any/all new water... like for water changes... and use a hydrometer to match the spg...>
I'm afraid to come home and find them belly up! One week and I'm already attached to Gholum, MeGosh and Abigor!
<Hopefully the beneficial microbes necessary for filtration made the rapid ionic and osmotic transition. Bob Fenner>
Sincerely, Jennifer Dixon

Juvenile Green Puffer
I have two green spotted puffer, and two figure eight puffer's in a 30
gallon brackish aquarium. All have been living peacefully together (more
or less :) for a couple weeks now. My question; one of the green
spotted puffers developed a cloudy "film" over one eye last night while
I slept. Do you have any idea what this could be?
<A "sort of secondary" infection, likely bacterial, stress-related... likely from the system being so new... crowded puffer-wise... and likely will solve itself>
None of the other
fish have any evidence of this, and the one fish with the cloudy eye
still seems to be swimming around healthy, and eating. Did he maybe get
in a fight? Or do you think he is sick? Thanks for your AWESOME site,
and priceless advice. Good-day!
<Maybe a fight, and not really so "sick" as in treatable for a condition, agent. I'd just keep the system on an even keel and wait this out. And you're welcome. Bob Fenner>

Tiny Tank, not so Puffer
Hello. I have a 4.4gal UK fishtank, which measures
42x22xh33cm. According to the standard rules for fish
per fishtank, it should be big enough for a Congo
Puffer (Tetraodon miurus). However, I read something
about this puffer somewhere that it needs a tank at
least a 50 gallon tank. If it was in my 4.4 gallon
tank by itself, would this be enough space for it?
Thanks
Tim Jeffree
<Glad to see you're investigating before buying... and yes to the present system being too tiny... even starting with a tiny specimen, it would be too "psychologically" crowded. There are some other small freshwater fish choices that would go here: the littler Danios, rasboras... perhaps a couple of small Gouramis... some plant material... Some coverage of these can be found on our site: www.WetWebMedia.com for your perusal. Cheers. Bob Fenner>

Tiny Tank, freshwater puffers, lobster feeding
Are there any types of fresh/brackish water puffers
that would do well in this size tank?
<In a 4.4 gallon? Not really... hard to keep water chemistry/physics stable... and "mean" fish/es that can/do damage to each other when confined...>
I want to start
off by keeping freshwater and brackish puffers, and
then when I'm more experienced at keeping them, move
onto keeping marine puffers. I'm going on holiday for
two weeks soon, and I know that you can get feeding
blocks for fish, but what can I do to feed my lobster
while I'm away?
<Get a fish food feeder here, and give it a few pellets per day of something "fish meal" based (like the Hikari "red" food).>
Thanks
Tim Jeffree
<And do reconsider the Puffer situation. You need/want to a larger system to ensure your success here. Bob Fenner>

Puffers and Lobsters (freshwater)
Hi, I've got a freshwater lobster that's about six
inches long. I keep it by itself in a little
fishtank, because it used to nip my catfish. Could I
introduce some little figure eight puffers or green
spotted puffers into the tank? 
<I wouldn't... they're likely to get eaten at night>
I'm afraid that either
the puffers would get eaten, or the lobster would get
eaten. Do you think that it'd be a safe combination?
Also, do you know how long the lobster can live for?
<A few to a handful of years. Bob Fenner>
Thanks
Tim Jeffree

Puffer Info
Hello again. Thank you very much for your advice before regarding my puffer
fish. I had questions about my 3 green and black spotted puffers in a 6
gallon tank; one of them was starting to turn brown. Well, the one that was
turning brown died the next morning,
<Yes, sorry to learn of this loss>
it was sad, but the other 2 are still
ok for now. I put a couple of rocks in the tank and they seem to like that.
But one is a lot bigger than the other, and is constantly starting to chase
the little one around. The little one spends a lot of time hiding behind
the rocks now. I am afraid that it will die.
<All very typical... need larger quarters to get away from each other>
It is still eating great and
everything. Today I was in a pet store and I noticed that one of the tanks
had little puffers the same as my small one with other bigger fish.
Unfortunately I don't remember what kind of fish they were with. I was
wondering if the little puffer would do okay in a 30 gallon tank that has
about 5 mollies in it, a small guppy sized fish that has horizontal stripes
on it, a Gourami, and 2 fish that look like bleeding hearts but they are
darker shades of reddish orange. They are all pretty lively but docile in
the sense that they don't nip at each other and pretty much leave each other
alone. They are all bigger than the little puffer except for the one with
the horizontal stripes on it. But it's an extremely fast little guy. Would
the little puffer eat him? I would really like to get the little puffer out
of the small tank with the mean big one in it. What do you think?
Thanks! Kari
<Well... the Puffer is not likely to be bothered too much by the fishes you list... in fact, the Puffer is much more likely to bite bits out of some of the new tankmates... You ought to check the physical/chemical requirements/ranges of these fishes to assure that they are mixable... maybe on fishbase.org... many of the fish species you list tolerate/enjoy hard alkaline, even brackish water, the "tetras" you tentatively identify do not...
Bob Fenner>

My 3 Puffers
Hello. I am hoping that you will be able to help me with my puffer
fish. I have 3 of them, in a 6 gallon tank. They are pretty small
still, and I think that they are MBU Puffers.
<Yikes... a very small volume of water for this species... hard to maintain stably... and these can be very "mean" toward each other>
They are the green one's
with the black spots on them. 
<Hmm, actually... this may be another species. Please see our site: www.WetWebMedia.com and in turn Fishbase.org for identification of this "freshwater puffer".>
Lately I have noticed that their colors
are changing. Sometimes the green is a deeper green and sometimes it is
a more fluorescent green. But then sometimes there is some brown
coloring between the white area and the green. What is this caused
from? 
<Could be simply "mood" changes, nutrition, water quality, even communication amongst them>
I was reading some of the other people's problems with their
puffers and one person said their puffers turned brown and then died.
Are my fish sick? 
<Maybe... most likely from "water quality" issues... may well be "brackish", needing some regular concentration of salts...>
I feed them blood worms, and all 3 of them eat them
aggressively, so I don't think that it's from lack of food.
<Solely this one item? Their diet needs to be expanded my friend. How healthy would you be only consuming your one favorite food?>
I have also
noticed that one of them is always trying to jump out of the tank. Is
the tank too small for them. 
<Yes, for sure>
I have heard that the puffers will do okay
in either a large or medium size tank, and like I said before, they
aren't very big. What does it mean when they don't have their tail
flared compared to when they do have it flared? 
<Once again, a number of possibilities: the beginning of a rapid flight/swimming due to... aggression, fear... communication?>
I have also noticed
lately that one of the fish is hanging out in the very top corner of the
tank where he is cornered in behind the heater and the filter. Is there
something wrong? 
<Possibly... likely this is the more subdominant individual and it's finding solace in staying out of the way of its nippy conspecifics... do look into either a larger system, making it brackish, and/or trading in all but one of these fish.>
Sorry for all of the questions, but I am new to this
and I love my puffers and don't want them to die. Thanks - Kari
<I appreciate this... extend your caring to investigating proper husbandry of your wet pets. Bob Fenner>

Unidentified puffer
Hi, I have been racking my brain trying to figure out what puffer I have.
None of the pics look quite right (juvi Fahaka, juvi MBU)....that is until I
stumbled across your page. You have a fish at the top of
http://www.wetwebmedia.com/fwpuffers.htm labeled as an unidentified puffer.
Do you know what it is yet? I have that very same fish and I am not sure what
species it is. Anyway, get back to me, I am rather interested to know what
info you have on it.
Clayton
<Well, thanks for causing me to get off my duff re this photo/specimen... think this is a Tetraodon lineatus (see fishbase.org for another image, info.)... though not as distinctly "lineated" as some smaller individuals I have seen. Perhaps check out the other twenty one species of the genus on fishbase as well... Bob Fenner>

Puffer confusion!!! (brackish id)
Dear Robert,
First of all I'd like to thank you for a great website. I'm in the process
of putting together my second website at the moment, and I'm running into
some difficulty with classifying pufferfish. My confusion lies in the fact
that there exists t. fluviatilis and t. nigroviridis. I have been
researching and trying to differentiate the two the best I can, since I'm
going to be profiling them in my website, "Puffernet". If I'm not mistaken,
the two are from the same part of the world (southeast Asia) but are brackish
and freshwater, respectfully. Is this correct?
<Both these Tetraodons are brackish and fresher water... take a look at the coverage of nigroviridis (note spelling) and fluviatilis offered on the fishbase.org site>
I don't seem to be the only
one confused on this matter, as many genome sites (you'd hope they would know
the difference) are calling them the same fish when there's two different
species (as per you and fishbase). It would seem to me that t. fluviatilis
has a more torpedo-like shape and is brackish, while t. nigroviridis exhibits
a more club-like form and is freshwater.
<Like, agree with your morphological assessment>
If I am correct in my nomenclature,
are there any other distinguishing characteristics for these two fish? I do
realize that t. nigroviridis is an inhabitant of freshwater streams and
rivers, and wish to pass that information onto the masses so these fish can
be properly cared for. Once again, I was wondering if you could shed a
little more light on differentiating the two fish. Thanks so much for your
time.
Fred
<Both fishes do best in water with some consistent salt mix make-up... both pugnacious, nippy toward unwary tankmates, both require meaty foods in their diets... fluviatilis "shinier", more discrete, consistent, smaller dots... Bob Fenner>

Death of 2 puffers
hi there...
<Hello>
will be grateful if you could help enlighten me... I bought 2 green spotted puffers... let's call em A and B... I put them in a fairly large aquarium round 4 to 5 feet wide kinds...A was pretty active when I brought it back, eating all the bloodworms I'm feeding them... but B is kinda sluggish... and when tries to eat something, A chases after it, so B gave up and I haven't seen it eating at all for few days... and soon B develops this horrid brown black colour all over it's body and start getting real skinny... after a few more days it died... I tot it was some rivalry stuff with the 2 of em so I ignored A...A is still eating fine and pretty active until one day it refuses to eat and at the end of the day it turn brown like B and died... I don't know what's the problem cuz at first I thought it was the water ... I just use freshwater without adding salt) cuz some sites says that puffers can survive in freshwater... so I tot B was weaker... but then the active A sudden death just puzzles me... before they died they don't seem to have any growth whatsoever on em and the color on their body always fluctuates from yellow to brown patches... is it really hard to keep puffers?... I heard they are hardy fish and the thing is my dad rear his other tropical fishes in his tanks till the water turns green and they still seem to be all right... thanks
<Yikes... very likely these "freshwater" Puffers were not so "fresh"... Please take a read over the "Freshwater Puffers" materials stored on our site: www.WetWebMedia.com and try to identify what type you had... I suspect these two perished mainly for lack of the salts found in their natural waters. Very common, and unfortunate. Bob Fenner>

Puffers
I was wondering if you could help me in figuring out what is on the bottom of my tank. I have two small green puffers and I feed them shrimp pellets and meal worms - as I was told by the people I bought them off of. I have been reading your web site and do plan on feeding them more of a variety. What my problem is that a cottony growth develops over the rocks and any leftover chewed up food they leave. It looks like a moldy fungus and I am afraid of what it is doing to my fish. I clean their tank once a week and this stuff appears almost right away. Do I need to stop feeding them what I have been immediately? What could be the cause of this growth and is their a way of preventing it?
<Good descriptions... and yes, you are very likely correct about the "moldy fungus" here... this is probably a mix of decomposers that are having a "field day" due to the abundance of ready foodstuffs and lack of competitors for such... do look to changing your food offerings as you say, and increasing aeration, circulation and filtration here... and you will find less of this material as time goes by> Thank you so much for your time
Nicole
P.S. I also have a 45 gallon tank running with no fish in it because I plan on putting the puffers in their; the problem is it is very salty and I wasn't sure whether too much salt is as harmful as not enough salt?!
<Yes... best to "aim for medium saltiness, and steady"... a specific gravity in the "teens" (1.011-1.018)... and pre-mix, store new water for changes... for a week or so ahead of using... and to acclimate your puffers for a day or more "per thousandth" ahead of moving them into a different system with a different specific gravity. Bob Fenner>

Puffer Fish
I have a question for you. I just found out that I bought a Figure-eight puffer (even though he was sold to me as a green-spotted puffer).. anyways I did not do much research on these fish before the purchase and I am next to new at this. This is my question.. it's a pretty simple one actually. Is feeding him shrimp pellets ok?<If this puffer will eat them, sure. Do also offer some meatier fare daily... like frozen/defrosted krill, shrimps of different sorts, silversides... as it is best to keep these tetraodonts full... Please read over the "Freshwater Puffers" on our website: www.WetWebMedia.com for much more>
He seems to really enjoy them even though some people have said they have difficulty feeding puffers pellets..
<Once tried, these fish really enjoy pelleted meat-based dried foods> 
the reason I am suspicious is a few web pages say I should feed him shrimp/snails to keep his teeth filed down. Is this true.. and will the pellets do that or do I need to buy the shrimp/snails? 
<Hmm, well, they will/do "chew" on most any hard material in their environment to do the same... I wouldn't buy snails for this purpose, but neither would I "peel" other shelled foods>
Do I need to do this when he is young.. guesstimating he is an inch in size. I rescued him from Wal-Mart and I'm sure he was fed primarily flakes in rancid water knowing them. He seems healthy in my opinion at this point but I do not have much experience with fish and disease.
TTYL, James
<As I say, please read over the FW puffer piece and FAQs posted on the WWM site... you need to know a few things about this animals desired water chemistry and temperament and... Bob Fenner>

New FW Puffer Mystery species/husbandry...
Hello,
I just bought a fresh water puffer and have never heard of or scene this
one it is about three inches long and on bottom it is white on top it has
big stripes going back from black to goldish light green color the name
they said it was is a Belem puffer but I see it nowhere on your site. 
<Only know of one place to send you here. www.fishbase.org... search their under the genus Tetraodon for descriptions, images that match your specimen>
I have this one in a 20 gallon long now do you know of any other fish that
will go with it? 
<Not without knowing the species...>
He is very aggressive from what I have scene I have a
Plecostomus in a different tank can I put him in their he is about 7 "
long. Also I was thinking something like an Oscar or convict will any of
these work with the puffer?
<Maybe... would investigate the types of life this animal is found with in the wild... and NOT buy livestock ahead of such investigation in future... You know better. Bob Fenner>

Green Puffer 
Hi Bob! 
My husband and I have 4 Green Puffers. Two adults, 
and 2 babies. One of the adult puffers fades really 
bad in color. Going from his beautiful bright green, 
to a pale green to where you can barely see his black 
spots, and then back to his beautiful green again. Is 
this a sign of stress? He isn't acting any different 
and is eating like the fat boy he is. I am hoping 
that you have the answer! 
Thanks! 
Stephanie and Doug
<Thanks for writing. Likely there is nothing wrong with the "flashing" adult puffer. These fish do shift brightness and markings with their moods... this one is likely just communicating with its kin. Do take a read over the freshwater puffer section and FAQs on the www.wetwebmedia.com site for more input on their care. Bob Fenner>

Ceylon FW Puffers
Hello,
I have two Ceylon puffers in my 55gal FW tank. We call them Jeckel and Hyde.
One minute they are swimming around, or shall I say up and down, and eating like
pigs, in full color. Their little bellies are white and the spots are bright.
The next minute, they are laying on the bottom, all black in color and barely
breathing. Once they start swimming again, their bright and healthy looking. We
just don't get it. The smaller of the two is getting worse, with more down time,
I think he might die soon if I don't do something. We feed the frozen brine
shrimp and occasional blood worms. What could it be?
Michelle
<Hmm, couldn't find this common name anywhere in my feeble memory, on ICLARM's FishBase, in TFH reference works... but do know this is actually a marine to brackish water species... and that likely what is happening has to do with a lack of salt in your Puffers water. Can your other livestock tolerate much salt? Like a teaspoon per ten gallons or so of uniodized (ice-cream, kosher...) salt? Or better, the same amount from a synthetic salt mix (like for marine fish tanks)? This is what they really need. Maybe take a read through the freshwater puffers section and FAQs on the www.wetwebmedia.com site: http://www.wetwebmedia.com/fwpuffers.htm
Sort of like you and I trying to "catch up" by drinking seawater...
Bob Fenner>

Re: Ceylon FW Puffers
Hi Bob,
Thanks for the email, I didn't expect to hear from you so soon. The real name
for the Ceylon puffer is Tetraodon, I think. 
<Ah, likely T. fluviatilis... common names are actually my bane!>
I don't usually use the scientific
names. They resemble green spotted puffers in body shape and size. Anyway, the
smaller of our two Ceylons passed last night:( for reasons unknown. You do put the right salt in our tank after every water change, our water is brackish. As soon as the little one died, the big one started failing too. I don't no what to
do:(
Michelle
<Any idea of how brackish your water actually is? Maybe the conductivity as a measure? I would/am still inclined to place more salt as I wrote last... Bob Fenner>

Figure 8 Puffer
Hi Bob,
I was wondering what other "mean" fish will a figure 8 puffer get a
long with. Thanks!
<Larger, faster, meaner types... the best really are other brackish water species... the other not-so freshwater tetraodont puffers, Monodactylus, scats, Chromides, archerfishes... you can find a bunch about these possibilities, even brackish water plants through a read through past hobbyist magazines... and goosing me to get more of my brackish pieces on our WWM site...
Bob Fenner>

Freshwater Puffers?
I found your address on the wet web media site. I seen a figure eight puffer and a green puffer at the pet store the other day. The worker was unable to help me. I was wondering if you could. I would like to know what kind of things they like to eat, are they aggressive, and where could I find more info about them? Any help you could give me would be greatly appreciated. Thanks Jodi >>
Hi there. Yes these two (the second really marine, though somewhat adjustable to more freshwater conditions) Puffers are eager eaters of most anything meaty. Most folks feed them "human consumption" type shrimps, fish flesh... And, unfortunately they're both notoriously "nippy"... not necessarily aggressive, but do real damage to easier going tankmates (fish and invertebrates), and thus should be housed only with "tough, mean" types of livestock... best, really in a dedicated "brackish" setting with other rough and tumble fishes, plants that can/do tolerate some concentration of salts. More information? Hmm, try inserting the word for their genus, Tetraodon, in your search engines, directories.
Be chatting, Bob Fenner

Sick puffer maybe
I have 2 figure 8 puffers and 2 spotted puffers in a 5 gallon freshwater tank. One of the spotted puffers just recently started sitting on the bottom or close to it in the corner. It looks like it has a discoloration line between the white part of the belly and the spots. It is kind of a dark area, all the way around. If you know what this could be please write me back.
Annie
<Sounds like what folks term a "stress syndrome" of these fishes (the first species freshwater, the second brackish to marine)... with nervous involvement, parts of the body do discolor... I would read and heed the materials stored on our site re these tetraodonts: http://www.wetwebmedia.com/puffers.htm
You need to add some non-iodized salt to the system, maybe some live rock (yes, as if this were a marine system) to speed (re)cycling in the different ionic environment...
Bob Fenner

Re: sick puffer.........
I am sorry to bother you again but today when I woke up my puffer whom I 
wrote to you about yesterday had puffy cotton like stuff on his body around 
his fin. Could this be something different? The per store says that its 
ick and I got him some "Furacyn" medicine but he looks worse today. :(
Also, do I need to add salt to my tank? I mean, I have neons, swordtails, 
shrimp, and baby swords. It is just a 10 gallon tank. Will the salt hurt 
them at all? Sorry to bother! Thanks a bunch! >>
<Not ich... did they ask if the appearance was white, discrete spots? Likely a secondary infection of some sort of fungus... and once again, nutrition and environmentally related. 
If you can understand the following, do add the salt and amend the foods as previously recommended. No amount of medicine otherwise will stop this problem... No to adding much salt with the Neon Tetras... Please either trade the puffer in (it will eventually eat the Neons) or the Neons... otherwise, the Swords will be fine with the salt...
The Puffer is a brackish to marine species and quite nippy/aggressive... with easygoing freshwater species... I would have encouraged you to leave such a fish out of your system.
Bob Fenner

Hurt puffer.........
Hello! I have a spotted green puffer. He is in a freshwater tank with 
female swordtails and guppies. I feed the other fish tetra color and I feed 
him brine shrimp pellets. His tail is curled up and his left fin is 
starting to rot it looks like. Not like Ich but just deteriorating. I have 
only had this tank set up for a week and the day after I got the tank set up 
I had baby swordtails. My fish went through a lot of stress separating the 
babies from the tank so that is probably the cause of this. What could be 
wrong with him? Ich? Fin rot? Maybe just a fight with another fish? :( 
I love my fish so much and I don't want to loose any! :) PLEASE help 
me?!?! Thanks so much! >>
<Likely the tail curling is nothing (this is what these puffers do) but pectoral fin is trouble... and likely due to being in a strictly freshwater environment (this species is actually more marine) and a too-limited diet... I would add "some" salt (a teaspoon per gallon ultimately... a teaspoon per day until you reach this amount... if you have no plants... or other livestock... the swords are fine... that are salt intolerant. And do look into other frozen, freeze-dried foods like Tubifex, mysids, krill, bloodworms... for your puffer. These two changes will reverse the current trend.
Bob Fenner>

Figure 8 Puffers
Will figure 8 puffers get on well with these fish. If
I get two fish, will they bother each other instead of
the other fish?
Sucking loach
Red tailed black shark
Dwarf Gourami
Kuhli (Eel) loach
Bronze Catfish
Neon tetra
Zebra Danio
Guppies
Flame tetra >>
>>
No... these marine/brackish puffers are "nippy", and will outright eat the neons and guppies... and bite the other fishes as they can approach them...
Bob Fenner

Re: Figure 8 Puffers
Are there any other types of freshwater puffer that
will get along with these fish?
Thanks
Tim Jeffree >>
IMO not really... even the truly freshwater species from the Africa and South America are fin nippers... Best kept with other similarly "mean" fish livestock.
Bob Fenner