help identify

I just started my first reef tank a week ago and used live rock to help jumpstart the cycle. I’ve started seeing a few hitchhikers (including an aiptasia, unfortunately) but found this weird little dude. What is it? The most I could find is a tube worm but I’ve seen others burrowed closer to the...

I recently had 2 fish disappear so I went to check the back of my tank to make sure they didn’t make their way back there, but instead I found these worms. I have regular bristle worms in my tank, but I’ve never seen them with tentacles/ hairs this long that go from red to white tips. Any ideas...

I found this almost red branching algae looking thing on a snail. Is this the case? If not please help me.

I’ve had this guy for some time now, scored locally, all brown and dying about 1/6th the size he is now. no idea what it is and have wondered since I got him. He was flat flat but has some interesting growth now. I assume it’s some sort of monti but not sure. Pics in different lighting but he is...

What in the world is this??

Woke up this morning to this on my clown fish. Any ideas what it is and how to treat.

Last two weeks my take has been taken over by this ugly stuff and I’m not positive what it is and I do not want to take action if it is the wrong ID and course of action. If anyone could help me figure it out I would greatly appreciate it! Thanks in advance!

I thought I was removing a bristle worm but when I saw these tentacles I was surprised and pretty grossed out. Hopefully I didn't leave half of this thing in my tank when trying to remove it. Sorry for shaky footage.

I found this in my tank a couple days ago. I have been searching for an ID on it since but am still at square one. Any help pointing me in the right direction, or anyone who knows whether it is safe to keep in display would be greatly appreciated. I thought one of my kids dropped a marble in the...

Hi. I've noticed a few of these pests (I assume) on my live rock. Does anybody know what they are and if I should remove them? Thank you!

Does anyone know what this coral is? I bought this at my local lFS today and the owner didn’t know what it was as well. I was thinking maybe a favia or chalice of some sort, but not sure.looks awesome though (pretty big)

Hello… Need some help… Can someone please help identify what macroalgae this is and what eats it? I have tried everything from sea hairs, two Texido urchins and emerald crabs… To no avail.

So I thought this was hard but it turns out it’s not not hard so i’m guessing sponge? What kind is this??? It just started growing in my tank randomly and I have no idea what it is

last night I found something strange on my torches plug. It’s been in quarantine for 3 weeks. I turned on my flash light to look at the tank to see if they’re were any critters or hitchhikers in the tank. I saw redish pinkish mucus substance just blobbed next to the corals base. Is this poop? Or...