slug id

Normal 4 am tank watching, doing a little scrubbing to fight off the uglies. Noticed this thing. I can't find anything that looks like it on the web. Pretty plain looking and also decently big. About 1 inch long. I hope I don't need to get rid of it since it's full of personality but please...

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...

Found this guy in our aquarium, no idea what it is. We kept in the back side of the tank for now until we know if we can keep or not. Anyone can help identify this?

I’ve had my 130 gallon aquarium for like 2 months and I have only introduced 2 clownfish and a Bicolor Blenny. Some days ago I noticed some little snails in the tank and I think they are Cerith so they are good. But today I saw this thing and I don’t have idea what it is.. help!

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.

Just saw this black round slug looking thing in my DT today. Not sure where it hiked from but it was about the size of a dime. Has retractable antenna and can move at a good rate. Kill or live?

I got 20 pounds of live rock that came with a ton of cool mushrooms and I put it in my qt this morning when it was still dark I saw this caterpillar looking creature that is red with white spots and horns I've looked for hours what it could be but I haven't matched a picture yet can you help...

Found dude bro in my tank. Not sure what he is, if he’s harmful or what he eats but I didn’t put him there and my puffer is very interested in him. He took a couple bites out of him in the video. But he has tiny little black eyes and what seems like a hard back the puffer couldn’t bite through...

Hey all, I’m transferring some stuff into another tank and seen this guy slithering? Anyone know what the heck this creature is?

I think I will need your help with these new neighbors. I call Google and have a beer while searching but I can't find what kind of starfish or slug it is. I only have one guy here because the other one was too shy for a photo shoot. Also these 2 pictures are the best I can take due to the...

My snails have been mysteriously disappearing so I cleaned out my sump today and found this in the rocks can someone help identify this? I suspect this has been leaving empty shells around my sump

I was watching my tank while feeding and saw some movement. I'm new to the hibby so I don't know a lot of different organisms.. anyone know what this is?? I think it might be a sea slug (cuz it moves just like a snail or slug) but I cant find anything that looks like it online. Should I be...

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?