identify hitch hiker

Hoping someone can identify what this invert is and if it’s harmful at all. Looks like a slug with a soft shell, snail without a shell.

There’s these weird little hair looking tentacles sticking out of my live rock in a few spots, seems to be alive, it can pick up little pieces of sand, it does that then lowers it back down every once in a while. Also, unrelated but any opinions on fluconazole. I’ve been considering using it to...

It looks like two small feather dusters to me, not completely sure. There is an empty feather duster tube on my torch skeleton. Possible culprit?

Hey everyone My tank is coming up to 4 weeks old now and these rogue anemones have popped up! The guy in the lfs said they are ball anemones and to remove them with tweezers but I’m scared they’ll multiply and cause more issues! I wasn’t worried about them but I plan on adding sexy shrimp and...

I noticed a pile of shells in the front of my four month old tank. I started with live rock. In the middle of the pile I found this urchin. It doesn't look like a black rock boring or collector tuxedo urchin. Any ideas?

Hey y'all, I am a new reefer just a week into cycling my 40 gal tank. I noticed some white tendrils floating off of an area of what I assumed was dead rock from my LFS. I also spotted some tendrils on a piece of live rock next to it. The dead rock was previously used in someone else's tank but...

Hi everyone, can you help ID this crab. It’s very shy. I have never seen it come out completely of the rock work. This is the best picture. I have been able to get of it. thanks!

Bought a new frag today and after it got settled in I noticed some hitchhikers. Circled in red is a feather duster but what I have circled in yellow has the appearance of tiny mushrooms almost. I am not certain if they are mushrooms or some other creature that has the appearance of a mushroom...

Well I thought I already posted but I’ll try again. Heya! Can anyone help me identify this one? I started a tank a couple weeks ago and wanted to give gsp a shot since I haven’t had any problems with my clowns and my levels have stabled out according to my LFS. The gsp has been doing great for a...

Hello! I was looking at my corals today and saw this guy on my candy cane. Tried looking online and I’m not sure if it’s a vermetid snail or a type of sponge. Can anyone offer any clarity and advise of what to do? I’m currently in the process of slowly transferring corals to a new tank and...

So as usual i stare into the aquarium admiring it, and this time a saw a worm like think that i think is at least 10 cm long. It's not a bristle worm, and i hope not a one of those horrible Bobbit worms. This one had maybe 8 arms near its head and the hands was long and searching for food on...

Hey folks! I noticed this guy cruising around my tank a few weeks ago. Didn’t think much of it, honestly. Thought it might even be a baby astrea but I can’t tell (mainly because I’ve never seen a baby astrea). It’s not causing any harm to anything in the tank, just cruises around the glass and...