what is this

Is this a gigantic vermatid snail growing on the flesh of my coral?

I was feeding my fish then saw this slug thingy hanging out on the coralline on one of my acans. I took him out and have him sitting in some water but I’m confused on where it came from because I haven’t added anything new to the tank. Someone pls help me ID this thing. Is he friend or foe...

A couple weeks ago I added 8 Berghia Nudi to my RS S 550 (~120g display) that is currently fishless due to encountering ich/flukes. The only things in there to my knowledge are coral, BTA (acclimation box) aptasia, single tiger conch, two tux urchins and a single short spine urchin. Today I...

So I bought some mushroom corals and they were connected to this drag plug. In the bag they disconnected and connected to a broken shell instead and seem happy. On the other side of the drag I noticed this tiny coral. Any help identifying it would be great.

Hello, found 2 of these snails on my glass last night when I came down at midnight to check it. They don't have trunks like Nassarius snails and are a orange, tan color I believe. Just want to be sure they are not a pest. Thank you!

Initially thought it might have been a mantis, but nothing has died from it, nor been disturbed by it seemingly. So I’m curious if anyone has had this happen. Below is a video and a listing of the little equipment I have running. Innovative Marine 100 Gallon INT Aquarium with full...

I found this guy at a local Petco. Of course they didn’t know. Hard to get a good pic but I am hoping someone knows what this kind of fish this is. For size reference, that is a little blue legged hermit next to him. Thanks

Hey guys! I’ve had this starfish for a couple months and at first she (or he) was under was under the sand a lot and come out every now and then. Recently she stays on top of the sand and I noticed this white spot on top. It’s not sand because it doesn’t come off. Also not sure what’s...

Guys!!! It’s been months! But I finally got a decent video of that darn work thing that’s always poking out the rock at night!!! It always comes from the same spot and seems to eat the left over food which is great! I am terrified that it’s going to take out some live stock though! Any ideas...

What type of algae is this? I need to fix it.

This showed up this morning. Not sure what it is. Could it be poop? Is it in the process of laying eggs?

This is currently what my tank looks like Question 1) the brown algae -read a lot about it being good, but how much is to much? I also have green algae on my glass. Question 2) close up of rocks with micro bubbles - is this okay? Question 3) should I be running lights on a normal day/night...

Can anyone tell me what this is? It started growing on a base live rock for a cave, so it does not have much light. It doesn’t move or retract when you touch it.

Don’t know what these are but found one growing on a rock and one growing on a Zoa Plz let me know what they are and if I should remove thx

Hello everyone, I was wondering if anyone could tell me what this is. I’ve never seen anything like it in any of my systems before. It’s mostly transparent and is stuck to the glass. It appears to have tentacles that it uses to feed from the water column. It’s very small, maybe the size of a...

Hey y’all, I posted on the first worm I found like a week or two ago and only got one response. But I just for another one and he’s a little darker than my first photos so maybe it tells y’all something different. He’s so small I found the sweet spot where my phone would focus. I haven’t put...

What kind of coral is this? The whole thing was the dark purple color but it recently started to lose tissue. It was attached behind another coral I purchased about 6 months ago. Today I noticed it has lost tissue and not it’s normal deep purple color. I don’t know what to do because I have no...

I woke up this morning and saw this attached to my Euphyllia coral. At first I thought it was one of my white clownfish since they like to hang out in this coral at night, but no. I checked my fish roster and everyone is accounted for. I've personally never see this before and wondering what it...

Can someone help indentify the item I circled in yellow? It has grown from nothing to this within about 10 days. It is super hard like a shell and I cannot get if off the rock with normal tweezers. I would have to use more force I think. (Don't want to bother it further until I know if it is...

Hi! About a month ago, I found this weird red-ish orange disk in the sand near the glass. It was before I had an account here, so I had no one to ask about it. I took some pictures of it, but it disappeared when the substrate was disturbed. (I'm assuming it was buried) Last night I saw it again...

I was vacuuming some cyano out of my tank last night, so I got the hose into the sand bed really well in an attempt to rectify the previous owners (and my dads while he had it for 6 months) long term neglect…. i don’t know where this came from, but I saw it sticking up out of the sand, so I...

Hey guys, so this thing is stuck on the inside of my tank’s glass. I have no clue where it came from and I have never seen it until just now, today. It moves with the flow of the water, but it doesn’t move locations. It’s just stuck in one place. Please someone tell me what this is, because I...

Found this guy on my glass today and was wondering what it could be. I haven't added anything in probably 2-3 months, one which was a clump of Dragons' Breath/Chaeto macroalgae. Current list of snails is as follows: 5-7 Ceriths 1 Bumblebee 1 Magherita (maybe 2?) 2 Money Cowrie It looks almost...