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FAQs about Live Rock Hitchhiker/Creature Identification 15
Related Articles: Live Rock, Reef
Systems, Refugiums,
Related FAQs:
Live Rock, Answering Some LR FAQs by James Fatherree,
LR Hitchhiker ID 1, LR Hitchhiker ID 2,
LR Hitchhiker ID 3, LR Hitchhiker
ID 4,
LR Hitchhiker ID 5,
LR ID 6, LR
ID 7, LR ID 8,
LR ID 9, LR ID 10,
LR ID 11, LR ID 12, LR
ID 13, LR ID 14,
LR ID 16, LR ID17 &
Non-Vert IDs 1, Tubeworm ID,
Polychaete Identification, Live Rock 1,
LR 2, LR 3, LR 4,
LR 5, Curing Live Rock,
Live Rock Selection,
Shipping/Moving, Placement,
Lighting, Water Quality,
Live Rock Studies in Fiji Collaboration &
Charts, Copper Use, Marine
Landscaping, Marine Biotope, Sumps,
Refugiums, Faux
Rock, | 
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Red Tube Hitcher 02/19/2008 Good afternoon! <<Hello,
Andrew here>> I've noticed some strange red tubes among some
zoanthids today and I was wondering what they were. I figure they
are some sort of filter feeder, but I'd like to know if they are
harmful to my zoas. These tubes shut and retract a bit if I touch
them. I have attached a couple photos of them. There are more on
that rock, too, but all seem to be connected to something in the
base. Thank you for your time! Zoë Stevens <<What you have there
is a sea squirt, or otherwise known as an Ascidian. These are a
harmless filter feeder and will not hurt your Zoa's. More info can
be found here and the linked articles and FAQ's.
http://www.wetwebmedia.com/ascidians.htm >> <<Thanks for the
question. A Nixon>> |
Who you calling a squirt?
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New live rock really is alive! Using WWM 2/14/08 Hi,
<Hello there> A couple days ago my girlfriend bought me a small
(half pound) piece of cultivated live rock for my tank. She got it
to help my tank rebuild the beneficial bacteria because I just broke
it down and started over almost from scratch. The tank is a 29
gallon and it had been running for over 20 years but had barely been
touched in the last 5 years (my father took care of it before).
After talking to someone at a well respected fish store, he
recommended I break down the tank and replace almost everything
(replace the crushed coral, remove the under gravel filter, etc.). I
took his advice and bought new crushed coral, replaced the under
gravel filter with an Aquaclear 50 and SeaClone 100 protein skimmer.
I also upgraded to a high output 50/50light. For the moment I'm
using the old heaters and one of the powerheads for extra
circulation. The only inhabitants are a Damsel, a Clown, 2 Bumble
Bee Snails, and a few stalks of Xenia (which are the main reason I
wanted to clean things up in the tank). After I broke down the
tank I put some of the old crushed coral in a bag in the power
filter to help with biological filtering. Otherwise almost
everything except the livestock is new. The only problem I'm really
having is that the PH is too low for the Xenia. <See WWM re pH
and alkalinity...> I think the problem is that our water is a bit
on the acidic side and even though I ran some of it through a RO
system, that only made the PH worse. <... removed what little
alkaline material there was...> We do have some Nitrates in our
water (<20ppm) <This is more than just "some"... I would not
drink this water, nor use if for cooking> but I'm not super
worried about that right now. Otherwise all seems good so far
with the water quality, though I realize the tank will probably have
to cycle again. Anyway on to my main question. The piece of live
rock my girlfriend got me looks beautiful. It's a deep purple and
has a good bit of plant life on it (which I'm fond of and hope will
grow). <Not plant... algae... looks like some sort of
Caulerpa...> I think it also has a couple pieces of Aiptasia on
it which I haven't decided what to do about them yet. After I
realized the Aiptasia might be hurting my Xenia I moved the live
rock to the other side of the tank. A few minutes later I noticed
that the live rock seemed to be moving! After convincing myself
I wasn't crazy, I realized it was moving. A small rift had formed in
part of the live rock. I took a flashlight and looked inside and saw
what looks a lot like teeth. Beyond that it doesn't look very "rock
like" inside. I also noticed that it closes up when I turn off the
light, so I'm fairly sure there is something in there. <Does look
like a bivalve...> I've asked a few people who might know and
they are baffled. They say it might be a Clam or Oyster but I can't
find any that look exactly like it. What could it be? I would
suspect it must be something fairly hardy to have survived in there
through everything. I'd like to figure out what it is so that I
know how to take care of it. I've included the best picture I have
of it. Do you have any ideas? Thanks. <Please read here:
http://wetwebmedia.com/bividfaqs.htm And learn to/use the WWM
search tool, indices. Bob Fenner> | 
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LR Hitchhiker: Sea Slug or Flatworm - 2/12/08 Hey WWM, (great
site!) <Hey Bill, thanks!> Today, my roommate and I were upgrading
from our 28g reef tank to a nice 46g bowfront. <Nice!> As I was
moving the live rock from the 28g, I noticed a very small critter
crawling on the glass. <How small/what size?> It looks like a slug
of sorts, two antennas, slug like body, with very small bright neon
green things running down it's back. <What kind of “things” -
stripes, bumps, ruffled/finger-like projections (cerata), etc?> I was
amazed to find yet ANOTHER critter to appear, and in turn, it brought me
directly to my computer in search of an answer. Any help would be
much appreciated. <Hmmmm, it does sound like a sea slug or flatworm
of some sort but without a photo, that’s about as close as I can get to
an ID. Most of these guys are obligate feeders that hitchhike into our
tanks, survive until the food source is gone, then die out. Unless you
have a tremendous number of these, or are seeing some damage, I’d leave
them and enjoy them for as long as they’re around. Please see WWM for
more information, comparison:
http://www.wetwebmedia.com/seaslugsopisthobranchs.htm
http://www.wetwebmedia.com/nudibran.htm > Thanks Bill <You’re
very welcome! Take care, -Lynn>
Re: LR Hitchhiker: Sea Slug or Flatworm - 2/12/08 <Hi Bill!>
Thanks, for that great info, <You're very welcome.> it appears to
be very similar to Flabellina exoptata, which I found through your link.
<Great.> I would say, it was about a centimeter long with finger like
projections running down it's back, just like you asked. However, the
colors weren't like anything I saw in those pictures. Maybe it varies
coloring as it ages. <Color can vary quite a bit with sea slugs. I’m
not sure whether it varies with age, but it’s possible. I know they vary
according to region, diet, whether they’ve just fed, or are starving,
etc. It’s entirely possible, though, that your little sea slugs could be
another species within the genus Flabellina, or in the same family,
Flabellinidae. There’s a lot of red, orange, and violet in that family,
but not much green, however. I did find one (Tularia bractea) that had
green cerata. Here’s the link for you to compare:
http://www.seaslugforum.net/factsheet.cfm?base=tulabrac Also, here’s
the species page for the Sea Slug Forum. This is a terrific site. If you
have the time (and T. bractea isn’t the right species), you can look
through, and compare the others listed:
http://www.seaslugforum.net/specieslist.cfm .> Thanks again, and I'm
sure you guys appreciate proper spelling and punctuation. ;)
<Heheeee! Yes, we do, and thank you! Take care, -Lynn> |
What is it? -bivalve ID 02/07/08 Hello WWM crew, and hope
your day is going well. We have a "critter" on our live rock that
we noticed some movement out of about a week ago. The LR has been in
the tank for about 4 months now and was fully cured when we got it.
It almost looks to us like some type of clam or something. It has a
sort of "tongue", for lack of a better word, that sticks out where
the bluish arrow is in the picture, and when we tap on the glass it
retracts and constricts. We also see it "close" from the red/yellow
arrow all the way around to the same spot on the other side, almost
like a clam shell closing. It is never "open" more than you see it
in the pic though, and we are quite curious as to what exactly it
is. It seems firmly attached or fused to the LR and the only
movement is when we tap on the glass and sometimes when we approach
the tank. So, oh wise and wonderful WWM crew, what is it? Is it
harmless or something to be concerned about? <Well it does
certainly appear to be some type of bivalve (and a pretty cool
looking one too!). I couldn't tell you which specifically. Please
see here for some help get a better idea of what it might be:
http://www.wetwebmedia.com/bivalvia.htm In any case, I don't know
of any such bivalves that could be any problem. They're all pretty
harmless.> Thanks for all of the great info and help once again.
Mike P. <De nada, Sara M.> | 
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Re: Unattractive Sand Bed, Lack of Coralline and Green Live Rock
2-05-08 THANKS. THANKS, THANKS, Rich - you guys are the
BEST!!!!!!!! I would never have attempted the saltwater hobby without
WetWebMedia help. (I try to limit my questions to one post a year,
however long that post is! (LOL) <Ask Away!> Aleasha P.S. I
recently discovered what I believe to be two tiny sponges (white, round,
fuzzy puffy things) on my live rock AND what must be a hitchhiker
from somewhere - a tiny sea hare-looking creature about a quarter inch
long. Hoping this is a good thing, and loving discovering new things
to add to my tank's (lack of) biodiversity. <probably tunicates or
sponges. This link should help, follow thru all parts for more info...
http://www.wetwebmedia.com/sponges.htm > Thanks again and will let
you know how it goes after implementing your suggestions! <Please let
us know if things improve!-Rich>
Critter identification and questions -01/30/08 Hello Crew,
I commend you all in your vast source of information you've put
together here on the web. I've spent countless hours reading through
this material and quite frankly, may have a case of information
overload. I'm new on the saltwater scene and loving every minute of
it. I've just finished setting up my 38 gal corner tank w/ a
4"-5" DSB and I added 40 lbs of live rock a few days ago from the
LFS. I few things have emerged for the LR and I'm hoping you'll
confirm what I think they are. I believe pictures 1 & 2 are button
polyps, <Pic 2 is an Aiptasia. Pic 1 looks more like a button
polyp.> although I'm not sure if they're the same species. I
think pictures 3 & 4 are the either bubble coral or more likely
bubble algae, <bubble algae for sure> but the one in 4 may be
dying. I'm also concerned that I may have partially covered the
mouth of #3 with LR (if it is bubble coral). <No, this is not
coral.> Can it move or reposition itself since I glued the rock
in? I've also seen some snails and a couple of small bristleworms.
What do you recommend I start feeding them all? <Please see here:
http://www.wetwebmedia.com/ca/cav1i3/Progressive_Recipe/Progressive_Recipe.htm>
By adding cured LR, can I consider my tank "partially cycled". What
do you recommend should be the order of additions? I thought I had
read somewhere to add corals first, then fish and finally
invertebrates and the clean-up crew. Is this correct, or does it
really matter? <Maybe this will help:
http://www.asira.org/cycling Also, please do make use of the
search feature on this site for more info.> Thank you for your
help...I'm sure I'll be back again soon. MIKE <Best, Sara M.> |  |
LR Hitch hiker ID... s – 1/28/08 Hi Guys and Gals, I've
recently gotten back into the whole aquarium thing after a long absence,
boy have things changed! Anyway, I'm fascinated by this whole Live Rock
thing. <Is indeed amazing> In fact, in the 5 months that I've had
the tank up, the only fish I've added is a fire goby because I'm so
amazed by all the things you get for "free" when ever I add live rock!
Okay, now I'm realizing that it's not ALL good. I'm pretty sure that I'm
a proud new owner of a Glass Anemone <Yes> So as part of the
battle, I bought a peppermint shrimp. We'll see how that goes. Please
tell me if I'm wrong about the ID on this little guy, I wouldn't want to
harm him if I don't have to. (Notice how the pests are always "he"s?)
<Mmm, yes... but hurricanes are labeled for the tender gender...>
Then I found this thing on the back of one of my rocks the other day.
It's bright green with darker green longitudinal stripes. It doesn't
like the flash on the camera either and closes up when it goes off.
It's not hard shelled, but firm. It's about an inch long and has a
really solid hold on the rock and doesn't react if I touch it. I was
thinking some kind of sea cucumber, but I've spent hours (at work of
course!) searching the web and WWM, but I don't see anything similar.
<Looks like a Colochirus to me...> Last but not least, there's this
crab... At first, I thought it was my scarlet crab out of it's shell,
but now I'm almost positive that that's not the case. The hole in the LR
he's in in this photo is about 1" in diameter. He uses those fans as
filters and grabs unseen stuff every couple seconds. I'm suspicious that
this might be what has been beating up on my fire goby. This is the only
time that I've seen it. <Is a type/species of Porcelain (false)
Crab... a Squat Lobster...> any ideas on IDs would be greatly
appreciated. I'm hoping that I don't have to try to get rid of any of
this. <I wouldn't> I would like to eventually have a mostly reef
tank, mostly soft corals and anemones. <Do read re this last...>
Thanks for all your help! I've been reading through other posts here for
the past couple of months and it seems like you guys have great info and
big hearts for taking the time to share it! Kirsten <A pleasure,
adventure to share. Bob Fenner> | 
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White bacteria/fungus growth on live rock... oh yes – 1/26/08
Hi Guys! Great website and a special thanks from someone who's just
getting into the hobby. I have had my 125 salt water tank for about 4
months and have enjoyed every minute of it. My water conditions are:
1.025 salinity, 0 nitrates, 0 phosphates and have various fish including
a blue, purple and yellow tang, a few clowns, 4 anemones, <Yikes...>
a couple of yellow watchmen gobies, pistol shrimp, about 40 snails, 25
Nassarius snails, etc. (they all seem to get along. I think it's the way
I introduced the more aggressive fish later on). My question is about my
live rock. I supplemented my live rock with some dead base rock hoping
the seeding would work and it the base rock has started to turn a nice
green/purple. <Mmm, likely will in time> Recently, however, I
have noticed a pure white growth starting on the dead base rock and has
now started to grow on my purple live rock. Is this bad?! <Mmm,
nope> I took a rock out and looked at it more closely. It isn't slimy
or 'hairy' and I tried scrubbing it off with no luck. Could this be
algae growing that hasn't got it's colour yet? <Yes... or...
sponges... but likely a mix of species... algal and otherwise... but no
real worries> Any help would be greatly appreciated. <Please read
here: http://wetwebmedia.com/lridfaq14.htm and the linked files above
in the series. Bob Fenner> Thanks, Pat
LR Hitchhikers 01/16/2008 Good evening Bob & Crew, <<Hello,
Andrew here>> I trust this e-mail finds you all well. <<Very well
thank you Mike, however your attached image only shows a white
square??>> It finds me confused, but I guess you get a lot of that.
I either just received a nice bonus from my LFS or I received a problem.
I'm hoping that you might be able to tell me which. I recently
purchased a Leather Coral of the Toadstool variety 3?- 4?across the top
on a 6?stem and it is now in my 14gal. Oceanic Bio-cube. This is a live
sand and live rock cube with two small A.O. Clowns, a tiny Common
Cleaner Shrimp, four Hermits and a Short Tentacle Plate Coral. I've just
purchased the Oceanic Skimmer for this cube but haven't installed it
yet. So far parameters are holding at 78 deg., SG 1.023, PH @ 8.2, 0
ammonia and nitrites, 10 nitrates, calcium over 300 (sorry, that's as
close as I can get - cheap quick dip test kit recommended by LFS will be
changing it for standard kit next trip). <<Good idea. The dip strip
variety of testing kit are very inaccurate>> To my recent findings.
The Leather Coral came attached near the edge of a small flat rock about
4? across. I had a perfect spot for this on the substrate and all was
well until this morning when someone in my office asked me Is this what
you mean by Live Rock?? Camouflaged and encrusted, if you will, right
into an edge of the rock is a living clam just over 1" long. A boring
clam I presume Dr. Watson. There was no colorful mantle to give it away
and the entire clam, except for a thin darker line around the opening
edge of the shell, is the exact same color and height as the rock. It is
opening and closing ever so slightly and slowly and was barely
noticeable. <<Would need a photo to give you an identification of
the clam>> Now if that wasn't enough, when we were examining this
tiny clam, we noticed that in the middle of this rock (relatively flat
across the top) there is an area approx. 1?x 2?(also relatively flat and
again looks exactly like the rock in color perfectly camouflaged) that
was moving up and down like a diaphragm, again just slightly and very
slowly almost unnoticeable but definitely moving. It looks like the
middle of this rock is breathing! <<This will either be a
flatworm/Nudibranch/sea slug and again, a photo would be needed to
identify this for you. Review the attached links on these>>
<<http://www.wetwebmedia.com/nudibran.htm>>
<<http://www.wetwebmedia.com/seaslugsopisthobranchs.htm>>
<<http://www.wetwebmedia.com/flatworms.htm>> Now I'm faced with a
nice palm tree looking Leather that seems happy enough, some type of
baby Boring Clam and who knows what (sponge?) all on a little flat rock
about the diameter of a tennis ball. Mother Nature can really pack it
in, I guess, but the Leather sure had that cultured look on display in
the store. Did everyone along the way miss all of this? <<Sometimes
the hitchhikers are not that easy to spot and some fish stores will only
give live rock a cursory look for obvious hikers>> I have a few
concerns here. I have been unable to ID this clam. Will it grow to 6? or
3 feet (if it survives)? It is still getting direct light from the stock
PC's on an angle because the Leather is tall and not too wide across
(but that might change soon) and I have no idea what is slowly pulsating
in and out in the middle of this rock! <<If you can email more
photographs of these, we shall be able to identify them>> Is the clam
at risk from partial shading from the Leather? Could this pulsating
?thing? be some kind of well camouflaged sponge of the type that can be
harmful to clams? Can a sponge look exactly like the rock? Could the
Leather be at risk from this as well? <<All these questions, and
more light on the subjects with pictures>> Folks, this one is beyond
my limited knowledge and powers as an aquarist. I need a surgeon and an
exorcist! Do you have either, or both, in your crew? I could just
bring this back to the LFS, but I doubt they will be bringing a Priest
to the operating room anytime soon either. They might just charge me
more for the clam and the creature from the deep that they missed!
Should I get these things out of my tank anyway? <<There should be no
need to take it back>> One just never knows what this hobby, and live
rock, will bring next. <<Its one of the wonderful aspects of marine
aquaria keeping, the little surprises we grateful receive on a new piece
of live rock, the diversity of life is immense> Any ideas?
Suggestions (other than Dr. Exorcist, that is)? Ok, ok, just one more
quick one if you don't mind (as if the first one wasn't enough). I
promise to make another contribution! (Don't worry - we all know that's
not why you ultimately do this) The LR in my newly cycled 29gallon
Bio-cube brought with it a ½? high white stalk / stem about 1?in
diameter and then the flat top is slightly larger than the stem and
sporting some tiny round brightly colored medium green polyps? I can't
ID this one yet either. Maybe it needs to grow a little more to make ID
easier, but in the mean time, I'd like to be able to look after it so it
has a chance to do so. <<Sounds like it could either be a Zoa or a
Paly, a photo again would be better, as all I could do is just guess>>
As always, your time and attention are greatly appreciated. And now?
my fish, my corals, and the creature from the deep thank you. Mike
from Canada, eh. <<Thanks for the questions Mike, I hope to receive
pictures by return and we can get this cleared up for you as soon as
possible and give you an idea of what you exactly have. A Nixon>>
Live Rock ID Help, Sponge Perhaps 12/5/07 Hello WWM Crew,
<Hello> First off, thank you for the excellent resource. WWM has
helped me establish my 29 gallon FOWLR. <Thanks for using it.> The
tank has been up and running for 4 months now, and things are going
great. Tank params are currently: Salinity 1.026, Nitrate 0, Nitrite 0,
Calcium 410, Temp 77-79 (Natural light causes slight rise during day).
<Could bump up the heater so the temperature holds steady at 79 if so
inclined.> I have some excellent coralline growth and have been told
the recent molting of my hermit crab is a sign of a successful
environment. I recently switched to 50/50 bulbs as my tank is
relatively deep. Within a week of doing so a bright orange growth
appeared on my LR. This growth is approximately 3 inches in
circumference overall and is composed of multiple tiny (1mm) hex's or
ovals. It is relatively hard (think Astroturf..not soft like grass or
hard like rock) to the touch and does not react when touched (no "open"
or "closed" state). A photo of this growth can be viewed here:
[url=http://www.saltbucket.com/d/11549-1/DSCN0794.JPG][img]http://www.saltbu
cket.com/d/11551-2/DSCN0794.JPG[/img][/url] . The growth in question is
just north of center in the picture. The shape is not easily seen in the
picture, but the orange color is apparent. The 'hex" shape is identical
to the green growth surrounding the orange growth. I am assuming both
the green and orange are the same specie of organism. If you could
please help me identify what this is I would greatly appreciate it.
Thank you again for all of the information and hard work you put into
WWM. Sincerely, Scott Pasley <Looks like some sort of sponge
growth to me, hard to be more specific without using a microscope. Will
probably continue to grow as long as whatever conditions favor it are
maintained.> <Chris>
White Squiggle?-11/28/2007 Hello Crew! After weeks of reading
through your website months ago), I have decided to start a Reef
Aquarium. Can you say INTIMIDATING? I have a couple questions. This is
my first post, and I would appreciate any constructive criticism. 1.
My readings and tank specs are as follows. 55 gallon standard
aquarium. Seaclone 100?Protein skimmer Tetratec 30-60 mechanical
filter w/carbon 2- 30 gal. heaters (maintaining 77-78 F) 2- 250
gph powerheads approx. 45-50 lbs. live rock 2- 65 watt actinic
blue? lights 2- 65 watt 10,000K whites salinity = 1.025 calcium
= 360 (supplemented w/ Fuji Gold) <Hmm, I suggest using something
else for calcium and alkalinity adjustment (Kalkwasser, 2 part solution,
and/or baking soda, calcium chloride, etc.) ammonia = 0 nitrite =
0 nitrate = 0 2. As far as livestock goes; 1- lonely Mushroom
A 3x3 in. colony of green Zoanthids 1- Pulsing Xenia 2- different
unidentified leather corals maybe finger and toadstool) 1- serpent
star 1- Cleaner Shrimp (HUGE!) about 10 of each: Blue leg hermit,
Astrea, and Cerith Snails. 1- False Percula (in quarantine) 1-
neon cleaner Goby (in quarantine) I also seem to have a sponge
infestation (About 25, Sycon's I believe... white, cotton looking,
ovular shaped with a "crown") I have a noticeable amount of little
bugs crawling around too, which from what I have read is good. (typical
microfauna?) <Yes, this is a good thing.> Onto my question. Last
night I noticed something extremely peculiar on a piece of live rock
though. It is a white, "squiggly" substance. It looks fairly porous, and
only extends about 2.5 in. Are these possibly eggs of something? I did
not find anything in your search feature that resembled this. And I
tried to get a picture, but had no success, it is too small and I cannot
get my camera to focus on it. Is this something I should worry about?
<Can you determine if this is a living thing? Does it retract during the
day? Honestly, it could be just about anything: mesenterial filaments,
egg mass, sponge, worm... it's really impossible to say without a good
photo.> Your help and criticism will be greatly appreciated. This
hobby is SOO extensive <That it is.> that it is a great to know
you are here to answer questions. Thanks a MILLION! <My pleasure,
Sara M.>
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