I found about 20 of these things in my sump and in my overflow. Does anyone have any ideas what they are? I thought they might be some sort of nudibranch but they dont move and they're only about 1/2 in.

this is a well established tank, not sure what this is on the glass, looks like some sort of egg? any help is greatly appreciated. thanks

I am just being a worried parent but what are these and are they a threat to the tank? Below the bubble coral I removed this next one from my tank. Looks like a centipede in the water. I have heard of bristle worms and stuff but i have never seen them. Can you guys tell me if this is...

Hello, new to marine keeping always had tropicals, so i am in the process of setting up (approx 9 month) and i have some critters that are keeping me up at night i find fascinating, and any help to id these chappies would be most appreciated,thanks The brown like shrimp there seems to be loads...

Hello everyone: I have a 40B gl reef tank running for over two years. It's about 6 months ago, that I introduce my last coral on my reef, and my system is very stable, Healthy Corals, fishless, BB reef; and not many problems to report, nothing unusual at least. My surprise is that after all...

Hi, I just found this in my tank and I am looking for help identifying it. This picture isn't the greatest and I will work on getting a better one. This crab is about 3/4" diameter, is brown had a little hair on it's legs. The claws appear to be more rounded. I just found him today and he came...

I posted this under general as well but, my fish are under attack! I seen one Cirolanid on one my fish's tail on Monday. I tried to catch him but I couldn't. Tonight I thought I would try to sneak up one what I thought was maybe one or two. I waited only at most 15 mins after lights out. When I...

Anyone have an idea of what kind of slug this is or is it even a slug? It's about the size of an unshelled peanut, grayish/brownish. doesn't move a whole lot but, i startled it and hide slowly in a hole, i have seen crawling. Thanks!

So I added live rock and base rock about a week ago. I had noticed these HUGE shells on the rock, but could not make them move no mater how much pressure I put on them so thought they were "part of the rock" Now that they are in my tank they move around from place to place. Any one have...

I pritty shure there fether dusters. But they seem to be growing in #'s. Also are realy likeing my candy cane coarl but cant see the fethers on those ones. I also have a green bubble growing on the side of a rock that has some soft coral on it. Can the dusters take over or are they ok. I...