critter

Hey Folks, I got some frags in my recently cycled tank and while they are thriving well, some have issues. Can I get help recognizing what they are? 1. Xenia stopped pulsing and there is this weird brown color stuff that I am not sure what is 2. The Clove Polyps have that elongated mass that...

Hi, Recently had what I believe to be some sponges popping up in the tank and they’re spreading quickly. The tank is 18 months old and there’s signs it’s starting to mature and the corals are doing well, I run a simple soft coral tank, 90G display. I’ve done a little research on sponges and...

Hello all found this little guy behind one of my rocks. It’s tiny and in a very low light area. On first glance I thought it may be aptasia, so I went to get it off the rock. It closed very quickly after being touched. After thinking about what I saw I wasn’t sure it was actually aptasia. I’ve...

I dont know if this is a worm or a spider star fish. I have not bought any star fish nor have I added anything to the tank in a very long time! I assumed they are worms but I dont know what type and if they are good or bad

I recently had to deport a rock hermit crab from my display into my sump due to it getting a bit peckish with my snails and it got me thinking.. What critters do you keep in your sump?

Can anyone please tell me what is going on here? Do I need to try to vacuum the things out? I also see some copepods hanging out with them. Please let me know cause my water changes this weekend. Do I need to do a heavy vacuum or just water change. I believe my clowns have been eating them...

Hi all No idea what this is. Hopefully you can see the pictures. I have been dealing with aiptaisia but this doesn’t feel at all the same. Spread like fore around the tank and I only notice it in shaded or very low light spots. Thank you so much

Tank is cycled I have no idea what these post growing off rock are? vermetide snail? I also have web like algae growing on rock, soft moves with current. Thank you in advance!

Hi. I have absolutely no idea what this is. Holds against glass quite strongly. Any idea?

Hello, found 2 of these snails on my glass last night when I came down at midnight to check it. They don't have trunks like Nassarius snails and are a orange, tan color I believe. Just want to be sure they are not a pest. Thank you!

Hi all needing some help IDing this worm/cucumber/tunicate looking thing that came out of ocean aquacultured live rock. The larger side slowly moves and changes length (more inflated/less inflated). I haven’t seen any sort of mouth or feathers etc. Any ideas? Thanks JF

Hello, Are these ball Anenomes? They are all over my reef tank and seem to be bothering my corals and stay open all day. They also attacked a baby hermit, and seem to be really aggressive. Also, any natural predators? (For a 40G tank) Or other alternatives to remove? Thanks in advance!

I have these little guys all along the glass in the sandbed. Have a few in the sump as well. They appear to make their own little cocoon type of thing when there is no sand available. Spotted a couple that are much darker in color, almost black, but couldn't quite get an angle on them to record.

I noticed this little orange-thing while checking out my tank today, thought it was a sponge at first but when I came back to look at it later it was moving and had revealed two little antennas! It only has two colours, orange that fades into a darker orange/brown towards the body, has a clam...

Anyone know what this is? LFS owner and I have been watching it for a week and have no idea, when it open fully, it gets out about an extra quarter inch. No tentacles or anything. It also reacts and will retract when touched

Hello, Can anyone ID this critter I found swimming in my tank earlier. I caught one to see if I could get a better view, but there were quite a bit.

Coral Only tank, no fish/inverts. Any idea what this little tentacle is? I recorded one of them but I see 2 short ones and 1 slightly longer one. If a pest, any advice on how to remove it?

I got a good deal on some live rock from a gentleman on Facebook probably about 50 lb for about 80 bucks. The rock looks good supposedly he was storing it in a container with a powerhead and heater I don't know if I believe the heater part but besides that The Rock is definitely covered in...

I just saw a relatively big worm come out from my rock and grab the leftover brine shrimp and then back out to the rock… should I be worried? What is this?

So I picked up some extra shells from the Lfs for my red legged hermit to give him some options to live in and when I threw this one in to my surprise some legs popped out… anyone know what type he his?? Black legs with yellow spots and yellow claws??? Got such a fright when I seen him come out...

Anyone know what these tiny bug/shrimp looking things are? They are all over this rock and under the coral. Are they good for the tank or are they about to kill everything in sight? Thank you!

Curious as to what all these different critters growing on live rock in my NPS tank are? I know some are sponges but I’ve included pics of a few I’m not sure of. I’ve seen most of it here and there before but I feed my NPS tank consistently so I’ve noticed new growths popping up everywhere on my...

Hi I have noticed these strange critters. Almost look like little flatworms but move like copepods they are dark red towards black to look at under blue lights. I think they are causing some tissue recession at the base of my acros and my candy cane coral? Or they may not be a pest and the...

Hi everyone, I was just looking in my tank with a flashlight when I saw a couple of unknown isopods crawling around my Zoanthid coral, these isopods seemed to be eating away at the fragplug. I went to google to see if they were harmful since i’ve never seen them before and I only came across...

So usually I never really pay close attention to anything in my refugium, all i do is get rid of some seagrape and Chaeto that have grown to an extent where it blocks off the top view of the refugium. This time after resetting up my dosing pump, i realized this weird creature hanging on the side...