I put live rock in my tank a few days ago and now I am seeing some type of snail crawling on the rock. The snail is dark in color with a flat purpleish shell on its back. Are these good to have in the tank?
It's shell kind of looks like a fingernail, and they are nocturnal. You'll get a few as hitchhikers on your live rock, and they are good scavengers, reef safe, good find!
Very true, I just found my first one last night hiding in a pore in one of my rocks. Almost looks like a very miniature crab, has long eyes and just resembles one. I really don't know what it is tho..
actually the white snail I mentioned above looks more like a type of slug. It does not have a shell. I am unable to locate a picture of it on the web as of now.