Snail Identification?

WWS

Reefing newb
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?
 
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..
 
I found another type of snail that is white in color and looks like it has snow flakes hanging from it. Are these ok for the reef?
 
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.
 
Back
Top