hitchhiker id

Hey I am trying to figure out what exactly these are. They covered the base of this zoa (my personal favorite of the tank) after a cyano outbreak. After multiple months of work and a uv sterilizer that is under control but this seems to be left behind. Could this just be like a ditritus worm or...

I have an interesting hitchhiker I would like to identify. It has been growing here along side this zoanthid and sponge. Originally when I placed the frag I had dipped, brushed and thought it free of all but the sponge which I decided not to bother removing. However a few months later noticed a...

First time reefer, tank is around 8 months old. Just started noticing a few of these guys pop up and would like to see if i could get an ID. They are in a rough/sandy textured tube. I cant see the base but it doesnt look like they curl, seem mainly straight. There are two clear...

From what I’ve seen from Google images, I don’t think this is aiptasia, but I could be wrong. If not, any idea on what this is? Seems to be a very thin tube protruding from rock with short red/orange tentacles coming out of end of tube. 8 month old tank with live rock. Hopefully this zoomed in...

Help pls I'm creeped out what the heck is this? Lol

Okay so I have this container in my tank that used to have my Chaeto algae ball but thats been gone for a while and nothing new has been added in months and now the cup has these fuzzy white almost squid looking things attaching to the plastic of the cup? You can see the vine-like leg things...

I just brought this frag home a few days ago and dipped, am seeing these weird things coming out between the zoas. I can see 3 pairs so far

I shined my flashlight on my tank at night and seen these weird worms that burrow in sand when I shine the light on them. In the video one was swimming... well wiggling and at the end one was burrowed. Does anyone know if these things are dangerous?

https://youtube.com/shorts/fIXCgW_Su4o?feature=share What is this creepy crawly critter? Found him near a small piece of rock I recently removed from the reef tank for my Algae ID post. Hard to tell from the paper towel, but he had a white sac-like thing on his behind. I had given the rock a...

Small roundish soft thing sitting on a “nest” of tentacles similar to that of a nudibranch or bubble tip anemone, however they do not move freely and are stationed where they are, have not moved an inch in almost a week. I think Nudibranch is ruled out When I touch them they react and “extend”...

I can identify some pineapple sponges. What are those white hairy things? Are those hydroids?

Hi guys, new to the site and relatively new to salt and in dire need of help. Long story short went to the beach picked up some shells and sand as a souvenir in a mason jar, and somehow it all wound up in the tank because the kids thought it would be cool to add the beach to the tank. Now I've...

I spotted this in my tank today and no idea what it is, it looks like a star fish. Can anyone help identify it please?

Noticed something blue in a crack on one of my coral frags I just got. I did dip the coral before adding it to my tank but didn't notice this for a few days. Also can someone give me the name/variant of this coral, I had it but forgot to write it down on my list.

Hi! I bought several kg of indonesian live rock for a new reef tank built. The rock was awesome, it was just two days out of water, it was very clean (suggesting it was collected from relatively deep water) and it looked full of live. Among all the stuff I found (many crabs and worms arrived...

Hello, i just noticed this thing growing on the side of my frogspawn coral. It's soft and the striped mouths close when poked at. After some research, I think it might be a sea squirt but I've never seen one that looks like this so I was hoping someone else could help me identify it. Is it...

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 just bought corals on October 31st and today i just noticed a really weird snail looking thing in my tank by my ricordea yuma mushroom coral. Is it safe to leave in the tank? I have a blue leg hermit crab and a trochus snail already and its a nano tank with 2 clowns.

I need some help to identify strange creatures in my tank. I have no idea what it might be. I have a tiny amount of aptasia that I am currently fighting and I thought that these might be babies, but they don't resemble aptasia. No tentacles or smooth stalk, and the little fan that seems to be...

Are these snails and this nem bad? I just got them in a frag swap.

Anyone have any idea?

So, this has been growing out of a hermit shell for a while and was just a white stalk. I have the stalks in several other places, but I noticed this one and have no clue what it could be. super cool looking.

Can anyone confirm this is a nudibranch and bristleworm? Released during dipping of some frags.

I haven't been able to figure out why my open brain coral is slowly dying, and then noticed this last night after the lights went out https://ibb.co/7VJ09PG My first thought was it kind of looked like an eye of a fish. This morning I pulled it out and on the bottom if it were these. I have...

I see these stringy things coming out of the sand all the time. I believe the worm stays under the sand and puts the strings out. I saw it on the glass and tried to take some pictures. Let me know if you can identify this. Thanks