critter id

It's gray and definitely has some little feelers coming out of it. Moving really slow. I noticed a bunch of white spots the other day. Could it be a baby snail? Nothing new has been added to the tank except two peppermint shrimp, that i was told were pregnant... or full of eggs. I took a little...

Anyone know what this little guy is? Hard snakey shell, red filter fan sticking out the end. Retracts when touched Harmless? Thanks!

Hey guys just wondering if this is Orange Coraline Algae? Or if it could be a Sponge of some sort?? Thanks!

Are these bristle worms or fire worms?

Is this a baby feather duster?

Please help!!! My boyfriend and I have just spotted these tiny tiny white spots in our tank! They kinda look like worms? THEY. ARE. EVERYWHERE. Can anybody try and identify these things?? *the picture isn’t the best quality, i apologize for that * Also, excuse the algae! *any tips on...

Found about 4 of these things in my sandbed coming out at night. White worms about 2 inches long or so. Any one know what they are?

I found this in the sand bed and don’t know what it is. After removing it, I noticed that the red strings are moving in the cup. I thought this was some type of algae? There are a couple of places near the bottom of rock that these red strings are, but I don’t see them attached to anything...

Hello! I’m completely new to having a saltwater tank and I’m trying to learn as much as possible. The other day I got a feather duster (been in my tank for 3 days) and today I saw this little guy crawling on him. Looks like a really tiny snail but I’m not sure.

Hi, i found this critter in my tank about a week ago and they disappeared and i found them again. Is it good or bad to have them in the tank?

Hi, Can anyone ID this nem? I’m looking for a nem that will grow into a fluffy tentacles anemone. Does only H. crispa does that?

So I have these white what looks like starfish to me, almost like micro bristle stars, but I'm not sure. They don't seem like asterina's because they're legs are longer and thinner from what I can tell. There's quite a few on the glass I see every few days or so. Anybody know for sure?

So I've started seeing these random white tubes along my sandbed and rockwork. Any ideas on what they might be? A worm? I'm really not sure.

So just spotted this guy this morning before lights came on. He started making his was back into the sand bed when lights started coming on. Can anyone ID if this is an asterina star?

Hi does anyone have an ideas as to what this is? The two antennae are actually part of the critter itself, whereas the rest of the spiral-structure is the “home” it builds (which is quite hard / like a shell — about 1cm diameter). obv my first concern is whether they’re harmful or just...

I’ve had this guy as long as I’ve had live rock (almost a year). He’s big, ugly, and I’m pretty sure he’s trying to reproduce in my tank. Slithers around on my rocks and eats algae, I haven’t had an issue with him yet. What is he??

I was looking at my tank tonight and i noticed these little "Worms" crawling on my sand... Then I realized, they are all coming form the same place. I gotta dig see what critter is in my tank now, as I am kinda protective of it to be frank! :) I'm certainly no Paul B that's for sure, more of a...

Does anyone know what these little buggers are? They are very, very tiny. This is the best photo I could do on my phone. They seem to multiplying rather quickly.

My LFS told me that I had an isopod in my tank based on a video I showed them. I think this is the same critter, can you tell me what this is? *IMPORTANT EDIT* and if it IS, could there be more????? Suspected isopod: Current captive:

Still as yet Unidentified purple live rock hitchhiker is translucent, reactive to light and danger from other creatures, will turn almost solid white when withdrawn near the entrance to its hole in the rock.

Found these lil guys while transferring a rock with waving hand anthelia from our 5gal to our 14gal. These ball tipped nems? i like them! Sorry about the pic quality..... its a potato.

Never seen this thing. Should I remove it?

If I knew what it was I forgot:oops: sorry

Two for one here: Question 1 is what are the eggs pictured below from? They are all over the place. I have searched for a few days now and cannot find an answer. It is about 3/16" or 5mm. I have introduced 2 Astraea (I believe, pictured below), ~18 Cerith snails and 6 dwarf blue leg hermits...