critter id

Saw these a couple weeks ago. They were on a piece of rock that was mostly buried in sand. They look like they're growing. 2 weeks ago they were just little brown circles.

Recently added coral to my tank and over night I have noticed some white micro bugs on the glass. I dontknow what they are or what I need to do to get rid of them.

Found these tiny critters under my algae scraper, not sure what they are. Does anyone know what they are? Hopefully you can see the video I posted with this.

Saw this in my 90g saltwater reef that was given to be by a friend. Never noticed it before. The tank is 8ish years old has been in my possession for about 6months. Sorry picture kinda sucks, he in the back of the tank under the rocks.

Just wanted to verify if these were fireworms. Found a bunch underneath a clove rock I took out to clean. Any worry with corals or to look out for with more of them?

Good day all, my assumption this is a baby bristle worm but would like a confirmation or a different opinion. Mainly hoping it’s not a B-Word worm! Lol! Thanks in advance!

After searching in here for 3+ hours to identify this, it's time for my 1st post in hopes you can help me figure out what it is :) AIO 28g nano is 2 months cycled, live rock, 2 clown fish, cleaner shrimp currently. Showed itself 4 days ago... Olive Green color, about 1.5" seems to have grown...

Hi everyone. I am new to reefing and I ordered this "clean" algae off Ebay. Long story short it wasn't that clean. Can anyone help me identify what this is?

Hello Follow Reefers, Out of curiosity can you ID this little white transparent critter for me. 0,12 inch / 0,3 cm small round white ish Transparent critter. I have several in my mixed reef and every day I see them in a new spot, which means they’re mobile. Simple question, Thx everybody

Hi there! I found this guy at the base of a monti: Any idea what this is? I am tempted to just take a razor and get it off there. Kind regards friendlyguy

By best guess is a baby flat worm based on images that I’ve seen from other people. Maybe a pod? if not, it’s my best excuse to pull the trigger and get a melanurus.

I’ve got a 37 gallon live rock and live sand only things in the tank as of now is a feather duster, astraea snails, nassarius snails, and a tuxedo urchin. I recently introduced a frag of zoa but I did dip it and inspected thoroughly before placing in tank. I noticed today a little critter...

Howya everybody, Brand new to reef2reef, been reefing a while though, not to savvy on all the little critters in the tank. Current setup is Red Sea reefer 350. ALK: 10.6 CA: 400 MG:1349 PH: 8.25 Salt: 1.024 Could I get an ID on this little guy? They’ve covered the glass out of no...

Hi i have found some if these in my tank and wondering what they are. I have been told they look like hydroids. Any help is greatly appreciated!

I have these white/brown stringy things on a couple of different rocks. It sort of looks like a feather duster but super super thin. Anyone have any suggestions? sorry for the bad photo quality. It’s just hard to capture a good picture of these guys..

Anyone know what this critter is? I have a lot of these on the back wall of my tank and a few on the front.

Happy Super Bowl Sunday! I was getting through some weekend maintenance before the big game and noticed this black object embedded in some Zoas. Didn’t think much of it until I noticed it had little antennas. I’ve never seen a black worm/slug like this before. Any thoughts?

I can see one and it’s some all white thing I’m thinking it’s probably some kind of snail it has 2 long tentacles or whiskers antenna whatever they are and that’s all ik but it seems to be living inside that coral only one seems to be on the outside a little tried to get good pictures thanks guys

Just noticed this on a frag that's been in the tank for about a month. I haven't seen them anywhere else in the tank so I guess it came on the frag, but just now noticing it. Can anyone help ID what this is on the base of this hammer?

I found this critter today. I am not sure what it is. Good or bad? Should it be killed with fire? Seems like a small orange worm with small white tentacles, or hairs, on one end and pointy on the other end. I hope the pics help. Thank you for your help!

Good afternoon all, I am on the downhill side of a ********’ fight with bryopsis (fluco ftw), and noticed some tubes on some frags now that they are not covered in algae. I am reading a lot of conflicting info, so hoping someone could give me a definite ID, so I can treat accordingly if needed...

After searching for copepods that resemble the ones in my tank, I am not coming up with any results or similar matches. Does anyone recognize the order/family/genus/species of copepods in the following pictures (encircled in orange)? I am pretty sure they are some type of copepod, but not sure...

So I have this snail I purchased from the LFS. It looks for all purposes like a tropical turbo snail. Thing is, it’s only active at night and buries itself in the sand during the day like my nassarius snails. When he comes out tonight I’ll get a picture. As far as I know turbo snails don’t dig...

Found these two little ones surviving in a filter sock. I don’t want to influence the identity by telling you what is in the tank.. Thanks for looking and your help!