id critter

Can anyone identify what these little critters are that were hiding in my filter media? Assuming a species of nudibranch? I had put two berghias in the tank months ago to try and get on top of an aiptasia infestation, but haven’t seen them since and am losing hope. These guys don’t look like the...

Hello everyone, can somebody id this I have seen it last night and it was two times smaller and only yellow and orange colours now that it popped out out of nowhere it has green part. I have no idea what it is and it's completely out of sand and when blue lights are on its very bright on...

Hello so I have this thing in the tank since almost begging and I have no clue what it is there was one other place where same looking guy appeared. It only sticks it's tentacles looking things and retracts doesn't so anything else so can somebody id this guy please?

I found this snail in my tank and would love some help on identifying it. I have nassarius snails, but understand that it is extremely rare for them to successfully breed in a reef tank. I also have TBS live rock that I added in June, so it could be a hitchhiker from that (I have not added...

Could anyone help me identify this creature? When I crank up my wave pumps (once a day for 30-45 second) a bunch of these come out of the rock work and around the aqua scape. The fish seem to like eating them but I am not sure what they are and I am curious is someone can help me identify...

Can anyone ID this thing on the glass? Is it a Copepod? Up close it kind of looks like a pill bug & it swims around the tank upside down, going to different areas of the glass… I’ve been seeing it for around 3 days now - it doesn’t hide in the rocks at all. Any help or opinions would be...

Alright I need some help identifying this thing. It's a white fuzzy ball looking thing. Riding around on my snail. Any help is appreciate it.

Im currently in the process of if cycling my Fluval Evo 13.5, I have some live rock in there, it’s been about week and a half and I just noticed this little worm guy? I’ve looked around and I think… think it might be a bristle worm? Can someone help me haha

Thought these were bristleworms but I’ve had small fish losses recently (pink streaked wrasse and a small female dusky fairy wrasse). Rock is ocean sourced from the Gulf of Mexico. What do you all think? *the two pics are of different specimens in the tank.

Hello I dipped some zoas in Bright-well Aquatics Koral MD cause I found some tiny critters on the rock of the zoas. Not sure what type of pest these are or how to get red of them since the dip did not kill them. Can you help me ID these pest. They have a pair of white antennas. Also found them...

Can someone tell me what is growing in my Sump tank? This is the largest growth but there are other spots. Should I remove it?

Hello everyone. Have a 120 gallon that's been running for almost 2 years now I have this weird white membrane that has been growing larger for several months It's become this Cacoon like membrane structure and I'm wondering what in earth it can be. This tank was started with all dry rock. I...

Hi everyone I am new here and tried to find a picture of this hitchhiker that came in on one of the corals I currently got but could not find anything. It looks like a baby tuxedo urchin? But I thought I would ask to see if anyone here knew for sure just go be safe. Not sure if it’s good or bad.

Hey guys, Wondering if anyone know what kind of hitchhiker these are? The are purple/red and look like a snowflake/flower.

Hey yall. I woke up this morning to find this thing next to my feather duster growing on the rock. It looks like a somewhat opaque hollow ball with two tubes growing out the front. Is this just my feather worm reproducing? Or is it something I need to be worried about?

Hi I noticed these little while guys a couple days ago. They are all over my rocks in low flow areas and some on the glass, corals and other places on my rock work. I think my wrasse has been picking at them because I see him running around picking at my rocks but I just want to be sure I know...

Found these critters in my tank today and I'm looking to get some info on them! The first is some sort of Starfish. I noticed it hanging around the other day and decided to leave it alone. Today I seen it on my new corals and decided to get it checked out. Hopefully it's nothing bad.. The...

Hey there fellow reefers. Tried looking up this one but couldn’t find anything on him. Moves incredibly slow and is about 2cm long. Looks to be yellowish/orange in color and is currently on the sand bed. Hope you can tell me if he’s beneficial or not. Thanks in advance ✌

Found a few of these in canister…. Not sure if vermintide snail and not turned brown due to no light….

I have multiple in my tank. Was curious to what they were, not the best picture but they’re pretty small.

Hello, My turbo snail flipped itself over this morning, and when I was helping it back upright I noticed it seems to have a very small critter with a shell attached to it: It has a curved shell that looks a bit like a cockle but seems to only have one side, and a little black 'neck' that is...

I have a long spine urchin, tuxedo urchin, various hermits, emerald crabs, snowflake eels, and file fish.

Hey everyone, A new conch I got was climbing up the glass and I noticed a black thing coming out of what looks to be a small red snail shell and I also noticed a couple others. Does anyone know what it is? Is it a snail? Is it a bad hitchhiker? I can't seem to upload my video to the post but...

I have no idea what this thing is, i just noticed it on my frag, i dipped the frag before hand as i do with all drags but???? It’s creepy and I’m not sure if i should be worried. I tried to get a good picture of it but the lighting is kind of temperamental sorry.