What is this on my snail?

You're right, it does look like it, only darker

 

The snail either has a montipora capricornis like grass had suggested, or it is a porites coral which oddly enough someone else a while back also had on there snails shell. I would lean more towards porites but it is kind of hard to tell at this point.

 

Wow, that really does look similar to porites, in my novice opinion

 

I think you both have your answers!!!! Good call on the Porites!!! Here's a link to one, not sure if you saw it, but it's "flowers" look to be about the same size as yours!Yahoo! Image Detail for static.flickr.com/3134/2704722893_6ce70edd58.jpg


and growing under pc's? I like it!

 

Good thing it's in a 18" deep tank then. Thank you all so very much.

Karma time!

 

Hey, lots of things grow under pcs!

no problem dude, that's what were here for

 

nano reefer good call now I finally know what that coral is.

 

i think thats awesome your snail has a coral on is back, thats pretty sweet.

 

Now I'm at a loss as to what to do. Should I let the snail roam around the tank with it or should I try to take the coral off and place it?

 

I say leave it. More than likely the snail stole a shell that had been sitting next to the coral. IMO if you try to remove it you risk damaging it. Who knows? Maybe the coral will like migration.