Infant Hermits? 10/10/2006
Aloha Bob,
<<Hey, this is Lisa :D>>
Perhaps you could shed some light on this mystery for me.
<<I shall try!>>
I have a 50 gallon salt water reef tank.  Fish and 3 Hawaiian red legged hermits are the only creatures in it.  One of the hermits was hanging out on a patch of algae for most of yesterday.  This morning when I fed the fish, I noticed some (a hundred?) tiny white dots on the same patch of algae.  Upon further inspection, these tiny white specks are mobile, and slowly moving all around on the algae.  Are these baby hermits?
<<Nope, they’re ‘pods.>>
If so, how do I help them live to adulthood? I always thought they wouldn't reproduce in a tank.
<<’Pods require no intervention on your part.>>
Thanks for any info or advice you may have in this area.
Mahalo!
<<Not crabs, but a nice addition to the bio-diversity in your tank!>>
Sheila (surprise crab mommy)
<<Lisa.>>

-Velvet? Nope Tis Pods-   9/4/06
<Justin with you tonight, who is up WAYYYYYY to late for his liking :) >
Greetings! I had a tank infestation of what I strongly believe to be Amyloodinium around 8 weeks ago. I had it about a year before with the unquarantined introduction of a Coral Beauty, and thought I conquered it but nevertheless it came back.  Lesson learned, always quarantine and keep water quality high! As far as treatment goes, too little too late. Two damsels survived, but all the other fish were too far gone. The damsels are in a quarantine tank that I treated with copper. I also gave them a freshwater dip with Meth Blue before going in and they seem to be doing well.
<Do be careful with the copper, don't use tank on scaleless fish and or for q/ting corals or inverts now.  best to mark and set aside as coppered.>
Rather than dosing the FO show tank with copper I chose to just let it go fallow for six weeks or so and theoretically get rid of or severely weaken the Amyloodinium, eh?  However, on the eighth week I am still noticing small white specks on the glass; about half are stationary and half seem to be moving. They are about the same size as a grain of sugar, looking very much like what infected the fish. They are all about the same size. I can scrape them from the glass and they will reappear a day or so later, with various amounts (sometimes only a few, sometimes they're all over the glass).   They are barely visible to the naked eye, but I can still absolutely tell that some of the specks are moving about. Patience is a virtue, yes, but I'm getting a little eager to get the tank going again at this point ^.^
<Those aren't Velvet cysts, but amphipods, copepods, etc, beneficial micro fauna, the bottom of the food chain.>
Would I be correct in assuming they are Amyloodinium tomonts, trophonts, etc? I realize it's kind of a wild shot, asking this through an email, and I suppose without a photo or sample that identification would be difficult. However, is it possible for Amyloodinium or some other  parasite to last this long (almost 8 weeks) in a fallow tank? Could they continue their life cycle without a fish host? The only things I left in the tank were 4 Blue-legged hermits (still going strong) and a clump of some sort of algae. Is it possible they can continue their life cycle with the crabs or algae but not become a problem?  
A week ago I added 35lbs of Lalo live rock (very very nice, from Drs. Foster and Smith). My only hope is that a tank sterilization is not necessary, since I really don't have money to just replace the live rock.  I figured I'd have to wait another month or so anyways to let the rock cure. Any invincible parasites ring a bell? Any experience with this sort of problem? Perhaps these specks are not Amyloodinium, but some benign thing that is always around. Never noticed it on the glass before though.....
On a good note, I have a new Rubbermaid sump that's working very well, and 475gph though the 75gal tank. New heater, Poly Filters, life is good. The Euro-Reef skimmer works like a charm, and with no clearance necessary to remove the skimmer cup it is absolutely a great product. Thank you for the recommendation on that, and thank you for your help. You guys (and gals?) do a great job with the site and it's a great resource I'm glad to have. I probably would not still be in the hobby if it weren't for the huge amount of info on here.
Thanks Again,
Bryan, PA
<New rock you added as well as the old rock being fishless has allowed the copepod population to grow and is definately a sign of a healthy tank.  At this point slowly adding fish over the next few weeks would be fine, but do go slower to allow the biofilter to catch up with each addition.  Q/t the new ones so you don't have to do all this again.  Good luck with your tank.>
<Justin>

Pods In The House!
Dear WWM Crew, I just transferred my live rock from one tank to another. I noticed something on several pieces that resembled a small cotton ball. They ranged in size from 1/4" to 1/2" diameter and appeared to be in spots that the fish could not reach.  The fish tank was thriving so I assume this life form is ok.
<I'd have to see a pic to make a solid ID on this one...>
I also encounter small 1/8" long critters when I clean my particulate filter. They are almost see through and will squirm when touched. Any ideas?
<I'll bet that these are amphipods of some sort. They are highly sought after by many hobbyists, and are generally desirable scavengers. In fact, many fishes, such as mandarins, love to eat them. You will often encounter them in refugiums or other parts of your system where they can grow free of predators (like mechanical filter pads! Consider yourself and your system lucky to have a thriving "Pod" population!>
Thanks once again for your web site. Brian S.
<And thank you for stopping by! Regards, Scott F.>

Free Swimming Parasites in Infected Tank?
Hello WWM Crew! I think your site is great, it is one of the most comprehensive sites on the aquarium hobby I have seen. Anyway I have a question. About 2 weeks ago, I had an ich outbreak in my 60 gallon which housed a dog faced puffer and a tomato clown. I quickly quarantined the fish and am hesitant to use copper in my main tank because of the live rock and things that live in it.
<Agreed, I do not like to use copper in display tanks and would never use it in the presence of liverock.>
I've decided to let the tank fallow for a few weeks
<One full month, please else a few of the cysts may still survive to re-infect your fish.>
and while I was looking at my tank, I could see these little white things floating around and a few of them were swimming. They looked like little oval dots with tiny tails. Could this be ich in its free swimming stage?
<It would be difficult to impossible to see Cryptocaryon free swimming with the naked eye. It is much more likely that this is some sort of plankton. It is one of the indirect benefits of fallowing your tank. The populations of pods blossoms without your fish predators.>
They almost look like baby sea monkeys. Any help is much appreciated! Ron
<Best of luck to you with the Ich! -Steven Pro>

White things - they're alive!
Hello, my 150gal FOWLR has been running for about 2 weeks now and everything is going well.  I've noticed a few tiny white bubbles on the inside glass for a few days but today there seemed like more and upon very close inspection they appear not to be bubbles but tiny white creatures!  I have to strain my eyes but they are definitely moving around under their own power, they look like tiny white scorpions scurrying along, thousands of them.  What could they be, is this safe? Scary!  I'm hoping to add the first fish next week...Thanks! Mike
<Very likely  no worries... some sort of micro-crustacean. Please see here: http://www.wetwebmedia.com/invertfa.htm
and the linked FAQs beyond. Bob Fenner>

Re: white things - they're alive!
Wow,  I got the man himself that time :) Thanks Bob, I did read that section just now, got ahead of myself and asked before investigating because it seemed so weird.
Here's the best shot I could get of what I'm hoping are copepods? thanks again! Mike
<Most all the smaller species of crustaceans that "pop up" in our aquariums are beneficial... might be amphipods, other groups, but most likely copepods. Bob Fenner>

White insects (pods)
This is probably a stupid question , but I have to ask!
<No problem, Don here>
I have white little things all over the back of my reef tank (they look like small maggots). any ideal what they are and do I need to worry ?
<A natural progression of a healthy tank. What are they? Food! Your fish will love them. You can scrape them off if they are on a viewing pane, if not sing to them every morning so they will be happy and get big, fat and juicy! Mmmmm>
                  thanks Alex

Micro-crustaceans
Thanks for getting back to me so soon.  I've been really worried about what these things were.  
<no worries... they are very desirable copepods, amphipods and other desirable zooplankton>
I did get a picture, decent I hope.  I've attached the full size picture and the zoomed in picture.  Hope these are OK.  On the zoomed picture, I think I can see some antennae on the bigger one in the middle.  Also, could these things come from the bag of  "living" aragonite I added to aid in the cycling of the tank?  
<not at all... I'm embarrassed that some folks in the industry sell such products as "live". Your got your "bugs" from live rock, live sand, fish water, algae or plants added, etc>
I hope they're not disastrous. Thanks again.
<so much to learn :) Do enjoy the journey. Anthony>

Bugs... 3/28/03
Hi,<Hey there!>
I have a fairly new, 4 month tank.  Percula clowns have died in the tank about a month ago.  I have waited for any parasites to clear, but still kept the snails and hermit crabs.  I have just introduced 2 new, 3" percula clowns and some live rock, yesterday.  Today, I see one of the clowns breathing very heavily and had white bubble like spots on his body, and even on his eye.  I will give him a freshwater dip today and hope it helps.<FW dips are a good start.  But I would like to see some quarantine tank holding first.>
The weirdest thing, though, is that I noticed that the sides of the glass had little specs of dust on them.  They weren't there before, but I got a little curious so I took a magnifying glass and saw that they were not dust!  There are hundreds, maybe thousands of these bugs attached to the inside of the tank!  They look like roaches with short curled antennae on one side and long straight antennae on the other side.  Are these parasites?  How do I get rid of them, or are they normal?  Is this what caused my first set of fish/anemone to die? or did it likely come yesterday from the live rock?<Most likely a form of pod.  Have you tried looking through WWM's Google search feature?  It should help you!>
Please help.<Hope this helps and good luck!>
Sammy<Phil>

'Pods in all their splendor.
<Hello, PF with you tonight>
I have many questions and you have already answered many in the past. Thanks for all your help. I have a 90 gal tank with 90 lbs Kaelini rock and 2-3" fine sand bed setup on 1/10/03. (will be upgrading to 4+" with fine aragonite sand. I will be adding this directly to existing sand base with current inhabitants which is 1 coral beauty and asst. of Turbos, scarlet and red tip crabs. Is this ok to do and do I have to qt the sand?) About 1.5 months ago we noticed small white worms on the glass that at first looked like microbubbles but they definitely move on their own. We determined that they are beneficial we hope. About 2 weeks ago in my CPR 1800 gph overflow box I noticed what appeared to be 1 tiny Mysis shrimp that I feed the fish/inverts in there. I thought it was dead but it was definitely alive. Today when cleaning the sponge in my overflow there must have been 6 or 7 that I removed. They look like tiny white shrimp. I do not see them in the tank or sump. Are these creatures a problem? and this may sound crazy but can they or any other parasites be transmitted to humans? Thanks
<These are amphipods and/or copepods. Handy dandy cleaners and a cheap source of fish food, nothing to worry about. As for parasites, the odds of catching parasites from a SW organism are much lower than FW. But, and it's a big one, watch out for infections from siphoning water (don't drink the water!) or from cuts on your hand. Wash your hands with a non-perfumed soap (and skip the anti-bacterial, all soap by it's very nature is anti-bacterial) before and after working in your tank. Use a clean towel to dry with, preferably one that you don't wash in soap and is strictly for the aquarium. I buy a pack of those cheapie clean up towels at Costco every year or so (my wife runs off with mine, hence the replacements). That way I'm sure I'm not introducing any detergents or softeners to the tank. Well that went a little far afield, but I think it answered your questions. Have a good night, PF>

Amphipods, Copepods, or Worms, oh my! - 7/31/03
Hello to everybody there, <Hello to you Travis>
    I have had my tank set up for a little less than a year. It's a pretty good system. The reason I'm writing is because today I noticed little pink colored bug or worm things. <Hmmm> They move real fast along the glass there is hundreds of them. <Fast is relative my friend. Sounds like some sort of copepod or amphipod, but maybe even some sort of Planaria or bristleworm. The possibilities are endless.> I didn't see them the other day. <Hmmm. Not unheard of but....probably there the whole time> They seem to be mating, with every match, one being a rose color and the other a real light pink? <Maybe sexual dimorphism. Interesting> Please try and search for me, I have a have come to the conclusion from one of your links dr. Smet (something) <Not familiar> that they are isopods and to remove everyone of these little creatures almost microscopic). <Nothing drastic here. No need to panic. Let's get a positive ID here first.> Please help me. I know there are thousands of species of small tank critters and most are good <Agreed> but some are blood suckers that will kill my fish. <Also agreed> I would send a picture but I would need a microscope attached to a camera. <That small, eh> 
                      Thanks, T
P.S. if you really want a picture let me know and I will reply to your reply with an attachment. Till then I can Figure out a way to take a picture. <Please try to send a picture. Also, observe them. Really look at the behavior of the specimen. Are any attached to your fish? When are they most active? Do they seem to inhabit a particular area of your tank? Your best physical description and a picture as tight and focused on the subject as one can get. -Paul>

Parasites As Houseguests?
Good Morning,
<Hello! Scott F. with you today>
I have an unusual situation which involves an unknown parasite...  At first I thought they were pods, but not too sure now...This past weekend I purchased an additional 10lbs of cured rock for my 2 month old tank.  Yesterday, I came home and found a swarm of pinhead size parasites swimming at the top of the tank... what's unusual about this is they disappear when I turn off the lights.  They are quite small but appear to be white/opaque and/or reddish in color (in fact I noticed a red one attached to my Chromis) not sure if the lights in the tank are playing tricks on me.  Anyway, my Yellow Tang appears to have white spots on his fins now (not sure if the ich is related to the parasites I just described), and unusually, my cleaner shrimp has been spending his whole time on the new live rock.  I tested the water, and everything seems normal... water temp at 78degress...  any thoughts what this might be? Andy Volkoff
<Hmm.. Interesting situation, Andy. It's hard to say what the "pinhead-sized" creatures were...Maybe not parasites, but possibly some sort of small crustacean or worm? Possibly harmless, but hard to say from here. A picture would be very helpful...I think that the Ich on the tang may be coincidental. or not. If the rock came from a healthy, fish-less system, it seems unlikely, though not impossible for the Cryptocaryon parasite to be present...I'd keep a close eye on the tank for a while to see if any of the other fishes become ill... I'm glad that the cleaner shrimp seems "interested" in whatever is on that rock...You may need to resort to more drastic actions (such as letting the tank run "fallow", while treating the affected fishes elsewhere) if a widespread ich outbreak occurs. Otherwise, careful observation is your best ally right now...Hang in there! Regards, Scott F>

Amphipods on live rock - 9/05/03
Hello,
Great website, I wish I would have found it sooner (have made lot's of mistakes).  
I just received about 30# of Florida Aquacultured Live Rock tonight.  I put it my 75 gallon tank, where I plan to cure it (no fish). <fine>  After about an hour of placing the rock in the tank I noticed tiny whitish, bug like creatures crawling on the rock. <likely amphipods> They look like little elongated aphids, or something.  Are these mantis shrimp? <Not likely. More like natural lower food chain animals more inline with zooplankton. Check this out: http://www.nova.edu/ocean/jthomas/apod.html or http://www.museum.vic.gov.au/crust/amphigal.html>  Will they overtake my tank? <they could...... and this is a great problem to have. They will eat detritus, algae, and leftover foodstuffs.>
One more, unrelated question (sorry).  I added couple of inches of crushed coral for my substrate.  Was this
a mistake if I plan on this eventually being a reef tank, should I take it all out and replace it with sand? <Well, sand is natural and ideal. I have a 3 inch crushed coral substrate bed myself. I have had it for three years with a low occurrence of nitrate spiking. What ever looks good to you.>
Thanks in advance for your expertise, <Our pleasure to serve you. -Paul>

Small crustaceans of some sort
Hi  <Hello, Kevin here>
I have noticed some critters on my tank that move like worms the back end looks like it is split and they are a light brown or beige color can they be shrimp <Likely amphipods, would need a picture for a positive ID.> I did add what appeared to be a peppermint shrimp carrying eggs before I noticed these critters <Peppermint shrimp youngans will swim around, where as pods will scoot and crawl around. I hope this helps! -Kevin>
thanks Manny

Strange things going on
Hi folks
After my last bout of ich I am again fallowing tank this time for 2-3 mo.s maybe more. I'm in the third week and my copepod population is exploding, <Is one of the good byproducts of running a tank fallow.> all water parameters good, corals and other inverts doing well. My question regards the huge number of shrimp like creatures that appear when circulation is turned off. These are about 3-4 mm long very visible as shrimp and have a pinkish red head and I am seeing even larger molts in the tank. <Neat.> I have 1 skunk cleaner about 2 mo.s now and I had coral banded which I lost when I raised the temp to combat ich (I think I raised it too fast) could one of these have spawned? <A possibility... could also be something else. The lack of predators in the tank will make all sorts of things show up.> I also have found a turquoise colored ball looking thing on a rock that has several openings and about five anchor/tentacle looking things that appear to be holding it in place. It sort of has a lobular appearance and shrinks up when I squirt water at it. It's about 1/2 inch diameter. <Perhaps a tunicate.> And finally my orange Ricordea is splitting and has attached a foot to a piece of loose rock. Now this piece is dangling with rock in mid air. Do I wait till it falls off or cut it and super glue it down somewhere? <I'd wait, then mount it.>
This Ricordea also has four mouths is that normal? <Hard to say what normal is sometimes. Captivity itself is abnormal.>
thanks mark
<Cheers, J -- >

Tiny Critters (shades of Don Ho)
I have a 110 gallon tank I set up around New Year's day which just cycled (used live sand and only 10 pd.s of live uncured rock).  I haven't added any fish yet am in the process of setting up a quarantine tank with some of the cycled water.
There are some "critters" in the tank.  Lots of very small (pin-size), white circular worm-like things on the glass and something that looked like a rolly polly (isopod?) that dug itself into the sand.  Are these harmless or should I be worried?  
<You shouldn't be worried unless you see small bug-like invertebrates hanging from the sides of your fish. Most likely these bugs you saw were either Amphipods, Copepods, or Isopods. In this case, they're harmless>
The aquarium store sold me uncured rock and said it would be ok for a starter tank and would help the cycling.  Now I wonder if I introduced some things that I shouldn't have.
I really enjoy reading your book!
<I agree, Bob's book is very informative.>
Thanks!!!
<No problem. Take Care, Graham.>
Elaine

Microcrustacean ID 4/6/04 
I can't find any pictures that look like this "thing." And I don't know if it's a friend or foe... It reminds me of a shrimp because it's front legs are similar to that of a shrimp (or praying mantis). It is about 1/2 - 3/4 inches long, white, with a dark strip down it's back. The picture is as close as I could get and the drawing is really bad but will give you an idea as to how many legs it has and where they are placed. Thank you for your time.  Patsy 
<its tough to say here, Patsy. The pic, although not clear, is helpful because the image alone looks like a harmless detritivore. But the creature in the image looks rather odd and not necessarily safe (a hint of isopod in the blur with dark eyes). Do look up parasitic isopods on our website and beyond to see if any resemble your creature. You might also send a description/picture to Dr. Ron Shimek at reefcentral.com (he has a forum). He's very informed about such micro-organisms. Anthony>

Isopod? Watch those fingers/hands :) 4/6/04 
These little critters started showing up in my girlfriends' new 20g Saltwater tank. I have looked at other pics on the net and they resemble some sort of iso/cope-pod. 
<yes... good call: it does look like it may be an isopod. Did you happen to buy any Atlantic live rock? (sponges, macroalgae on rubble/rock, aquacultured live rock or live sand)... common sources. Be careful, if it turns out to be a parasitic isopod. They can pinch/bite you too!> 
I haven't been able to find out if they are parasitic and harmful. The tank is fairly new, and would like to fix the problem if it is one soon! I have been able to collect one specimen tonight with an eye dropper, but they are very fast, and easier to view in water of course. Sorry if the pics seem a little fuzzy. Thanks in advance! Steve 
<do bait for them at night with a piece of fish meat (thawed food fish) to see if we can get a better look/picture for correct ID. Kindly, Anthony>

'Pod ID?.....these are strange ones
Hi Crew,
<howdy>
I've noticed a few little critters in the upper layer of my tank when the pumps are off... They are noticeable because they have quite a jerky swimming action, sort of like a little tiny jellyfish
the best description is a white dot, with four "legs" each terminating in a white dot, but with the whole creature maybe 1-2mm (1/16 inch) in length. They swim by opening and then closing the legs/feet, to give a jerky swimming motion. Any guesses??
best regards, Bob (UK)
<sounds like some sort of microcrustacean... plankters. All good :) Do reference it (without a picture we cannot) by delving into some marine science books... perhaps even utilize the line drawings in Martin Moe's wonderful old "Marine Aquarium Reference" or his "Handbook... Beginner to Breeder". Anthony Calfo>

Shrimp loss/bug appearance link?
I couldn't find an answer to this question but sometimes my wife has accused me of not looking behind the orange juice. I recently lost a cleaner shrimp.. just up and died. I was not too concerned about that but I have very very small white things on the glass surface of my tank. There are many. The fish don't seem to be affected. I have a hippo and two clowns and a wrasse plus some crabs and another cleaner shrimp. No problems with any of the fish but concerned about the white bugs.  Any help would be appreciated.
Thanks, David
<It is extremely likely that the appearance of the "bugs" has little to do with the timing of your shrimp loss... perhaps the latter's passing contributed something nutrient-wise to the water... but the small crustaceans you are seeing are unrelated otherwise. Bob Fenner>

Re: Shrimp loss/bug appearance link?
what are the small crustaceans and will they be a problem to the fish?  Thanks again.
<Don't know even to the Class w/o a good micro-pic... likely an amphipod or copepod... take a look with a magnifying glass... on the Net and these names as a reference. Bob Fenner>

Microcrustaceans (4/28/04)
Thanks for the info on my salinity/SG. <My pleasure.>  It seems to be leveled out at the moment.  But, I have another dilemma.  I've noticed that there are tons of little what look like baby shrimp crawling all over the tank. <Lucky you!> I'm assuming they came on my live rock, since I haven't put anything in there.  Is this a
bad thing? <No> If so, what should I do about it? I've read about a type of shrimp (Mantis) that are pests and was wondering if that's what these are. <NO. Mantis shrimp are big carnivores. Check for pix on WWM.> They are so little yet it's hard to tell. <They won't get much bigger. IF they crawl, these are most likely amphipods and/or copepods. If they swim, they're most likely Mysis. Great live food. Read more by searching these terms on WWM.> Any suggestions? <Don't worry. Be happy.> Thanks Jen <You're welcome. Steve Allen.>

Nitrites and little white bugs
Hi Blundell!  I have some general questions:
<< Hi. >>
1.    I recently mixed a batch of artificial salt into purified water in a
7.7 gallon tank.  No fish, no rock, no sand, no nothing.  Just a power head.
I've had it running for about a week and when I took the PH today it was at about 8.1 or so but the Nitrite level was .05!  My question is what is causing it? << I'm guessing some very small impurities in the salt.  But that is nothing to worry about.  If you were to add one teaspoon of flake food to that tank and test the water in a week that number would be much much higher. >> There's nothing in the water to produce ammonia!  Am I missing something?
2.    I have a 20 gallon container that I am using to cure live rock in.  I have an 800 gph power head circulating the water.  It's been in there for 3 days and I am using natural sea water. << You are fortunate to have that resource. >> I took the Nitrite and, as expected, it is off the charts.  I took the PH and it is at about 7.3 or so.  Do I need to take steps to raise up the PH or do I concentrate on getting the Nitrite level to 0 first.
<< I'd change water.  I think that will solve both areas during this cycling process. >>
3.    Is there anything I can add to lower the Nitrite level more quickly in either established tanks?
<< Hmmm, not really.  I think move live sand and rock always helps, and then just giving it time. >>
4.    I am seeing what looks like little white bugs is the best description I can use for these little critters in my 24 gallon marine tank.  They are on the glass.  I have some live rock in there, a Clown Trigger, a small eel,
a couple of damsel fish and two small anemones.  What are these things and how can I get rid of them?
<< Oh don't get rid of them.  Most likely copepods which are very beneficial to your system.  You want as many odd little creatures as you can get in there. >>
Thanks so much for all your help!
Martin
<<  Blundell  >>

Shrimp? - Microcrustacean ID   1/7/06
Hi,
<Howdy Liz.>
I know a photo is the best way to go but these little creatures are too small. I have a SW tank with some live rock. I've noticed these very small (1mm - 2mm) grayish shrimp like creatures scurrying around all different parts of the water column in what look like groups of 25 - 40. They typically are active at night with the lights off. Any idea at all what they might be?
<As you've expected, I can't give a definite ID. Many choices though I'd bet you're seeing Amphipods.>
Also what creatures would eat them and keep population under control?
<Many choices here also.>
I currently have a Camel shrimp and 4 hermit crabs in a 55 gallon tank.
<Start here  http://www.wetwebmedia.com/pericaridanfaqs.htm . Find out exactly what they are to help in fish selection. DON'T let someone tell you "Yeah, now you can get a Mandarin." These will wipeout such populations in days, then go on to starve to death, unless you take measures to keep a heavy population at all times. Many other choices you can make.>
Thanks,
Liz
<You're welcome. - Josh>

Killer Pods/Jaws IV   1/26/06
Hello, <Hi Dan>
I just added a refugium with Chaeto to my 75 gal reef/fish tank about 3 months ago. The first thing that I did was get a piece of rock from a friend that had Mysis shrimp in it. Within about a month and a half my fuge was loaded with them as well as amphipods and many other types of pods and microcrustaceans. The other night, when the fuge lights came on, I watched for a while and noticed no Mysis shrimp zipping around like usual, also no amphipods or others. With a closer look I saw tons of a kind I have never seen before. They are a bit smaller than the size of a grain of rice and they are flat. They walk on about 10 hair thin legs and don't swim at all. They are whitish clear with a little bit of marking on their back... maybe faint brown. Then I saw two of them fighting and saw that they actually have pinchers like a praying mantis, or scorpion that fold in.
I watched them eat a piece of flake food and observed them for a while. The only time I saw them use their pinchers was for fighting. Could these new pods have killed or eaten all of my others? <Sure sounds possible.> What should I do? <Dan, whatever they are they are definitely not pods of some kind because pods have six pair of legs and do not have pincers.  To me ten legs suggests a decapod of some kind. Pretty hard to ID it without seeing it. I ran this by Dr. Adelaide Rhodes, School of Aquatic and Fishery Sciences and she is more than willing to ID it.  If you are interested, send a specimen in a small vial preserved in 70% alcohol to:
Adelaide Rhodes
School of Aquatic and Fishery Sciences
Box 355020
University of Washington
Seattle, WA  98195
<Bob may or may not have read this, if he has he may have some input here also.>   <<Nope>>
Also, one more quick question, When I add Phytoplankton, does my skimmer take it out. Should I turn it off for a while after adding invert food? <Yes, it will remove some.  I'd shut it down for an hour or so.>
Thanks for any help, <You're welcome.  James (Salty Dog)>
Dan

OSTRACODS For Mr. Fenner: follow up regarding bugs/parasites - 03/07/2006
Hi Mr. Fenner,
Just to let you know that I could finally ID the organism: they are ostracods. I found some info about them. Here is a link:
http://www.gre.ac.uk/schools/nri/earth/ostracod/introduction.htm
I could not find anything about them parasitizing corals so far.
<Mmmm, I don't think this is likely... though there is an ever sliding scale twixt commensalism, mutualism parasitism, predation... and many intergradients>
It seems they can even be a bonus for my mandarin. Although given the number of ostracods
in the tank I think he may be ignoring them.
I still don't get it why there is such a high concentration of ostracods on that torch coral thought... I guess I can only keep an eye on it. Please let me know if you have any idea or comments.
Thanks!
Dominique
<Thank you for this update. I would leave these organisms be... much more likely to benign to beneficial... than harmful. Bob Fenner>

I'll take invert. ID for one thousand Alex  5/29/06
Hi. I have a 75 gal system with about 100 lb. of live rock. I have a lot of black pod clusters (8 to 10 in a cluster of 1/4 to 1/2 inch pods).
<... very large for copepods...>
They have multiplied a lot lately but I have no idea what they are and am having difficulty finding an applicable reference to them in your answered questions. These pods are jet black and quite hard. There are some on almost all of the rocks in our  tank except the ones with large mushroom populations. What are they and are they detrimental to the health of my system?  Thanks
Bob
<... Pods? What's that line from William Goldman's "Princess Bride"? "I do not think that word means what you think it does"... Do take the long read on WWM re invertebrate ID: http://wetwebmedia.com/non-vert.htm
and the many linked files above... and send along a pic and better description if you'd like. Bob Fenner>

Marine Velvet...Copepod Invasion - 06/14/06
My tank currently has velvet and I have it under control and am letting it sit empty to cycle through.
<<I assume you mean "velvet"...letting the tank sit fallow for 6-8 weeks is a good approach.  I'm guessing you have had a read here: http://www.wetwebmedia.com/amylloodiniumart.htm >>
But now I have an issue with little bug like creatures in my tank.  I have looked in the pest control section of you site but could not find anything resembling these guys.  These little white bug-like creatures are all over the glass.  Each is about the size of the tip of a pen.
<<Ahh...not pests...beneficial copepods.  Do some reading here and among the associated links:  http://www.wetwebmedia.com/copepodfaqs.htm >>
There appears to be hundreds of them all over the glass.
<<Is a good thing>>
At first I didn't think much of it and brushed them off of the glass, but now there seems to be little cockroach looking creatures about the size of a pin head crawling all over the rocks now.
<<Likely amphipods...another beneficial (group of) organism(s).  See here:  http://www.wetwebmedia.com/amphipodfaqs.htm >>
I was just wondering what these things are.
<<Beneficial crustaceans>>
Is it possible that after I let my tank cycle the velvet problem out the fish will eat these creatures?
<<Oh yes!>>
Or what do can I do?
<<Study and enjoy>>
Does something need to be done?
<<Nope...>>
Thanks, Jonathan
<<Quite welcome, EricR>>

Sea star and white bugs 6/31/05
Hi. Thanks for your reply to my starfish earlier this week. If you don't remember me, I have the 92 gallon saltwater tank, and a sandsifting sea star that won't go under the sand. He still has not went back under the sand, but is moving a few inches here or there. Well today I noticed there are thousands of white bugs crawling all over the glass in my aquarium. The live rock was quarantined and "cured" for 3 weeks in a 30 gallon trash can (don't laugh, it was much cheaper that way, and very easy). It has since been in my tank for 2 to 3 months. I just noticed these bugs, but they are EVERYWHERE on my glass. Could this be why the star is staying on top of the sand? <Yes, probably feeding on the pods.> Do they eat these bugs? <It's on their menu.> The bugs, which I have been reading on, could be copepods,<I'm sure they are pods.> but I'm not sure. They are tiny, white bugs. They crawl very quickly, have antennas, and what appears to be a tail? It is hard to tell exactly what they look like, for they are very small. Would my rock have already created these guys? <They were present in the rock.> Do I need to buy some fish to control them, like a mandarin fish? If so, by the time I quarantine him won't these bugs really be out of control?<Mandarins do enjoy the pods, and the more pods the merrier. Problem is that once the pods are gone the mandarin starves as they are difficult to acclimate to other foods.> Please help me, I have read all about copepods on your site, but don't feel satisfied that this is what is in my tank. I also checked another site trying to figure this out, and it said they may be parasitic, but I see no evidence of them on any of my fish.  Do I already have something in my tank that preys on these things? To refresh your memory I have a 7" Regal Tang, 3" yellow tang, 2" and a 1" True Perculas, 2" yellowtail Damsel, 3" bicolor Pseudochromis, 2 Scarlet skunk cleaner shrimp, 2 sand sifting sea stars, 1 fancy red sea serpent star, lots of crabs and snails. Please help me, I was just sick at work today worrying my tank is going haywire!! It just ruins my day if I think something is wrong in there. Thanks so much for your wonderful site. I think you guys are the best out there. Sorry to be such a bother, too. Christy. <Christy, no need to worry.  They are a very good food source and they will disappear shortly as some of the inhabitants will consume them.
James (Salty Dog)>