"Snail" on my pocillopora frag...
 

I recently picked up a small frag of Pocillopora and just the other day I turned it around and now I have noticed that there is something that looks like a snail living on it. This snail however does not leave the poci and doesn't really look like it has a shell......more like a small short tube that it lives in attached to the poci. Reason I say it looks like a snail is the two antennae sticking out from it. I'll TRY to get a decent pic.

Here's a pic...

Its a vermitid snail, its harmless, the pocillipora will just grow over the shell