Weird looking Snail without a shell???

Aquatic Pet

Reefing newb
Today, I was looking at my tank and I noticed there is a creature in there that looks like a brown snail without a shell. They move around the tank fairly often not staying in same spot for long. Today, I added my first 2 frags and im wondering if i should take these things out.

Also, while i am on here, this isnt a id question but will turbo snails eat my frags? I have 2 rock pieces with little frags on it to begin my reef. I noticed when i put them in there, the turbo snail went over and was all over the frags.
 
That is what it is. I have 3 of them in there. Stomatella. They wont mess with my corals will they??? They seem to be staying on the rock.
 
stomatella if nothing in the tank to slow them down do reproduce at a good rate also.. I started in my sump with a couple, a few months later I can see 10 but am sure I am missing more..
 
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