Interesting little guy, what is it though?

I've just started managing the fish tank at my office since the company they hired werent exactly cutting the mustard.

I was doing my normal routine this morning and noticed this little guy sucking the alage off of a turbo snail.

His shell doesnt surround him it's only like a hat and the two green dots right on the front edge of the shell look like eyes.

Sorry the pic isnt the greatest, it's a bowfront and tough to take sharp photos.

Any ideas?

 

Oh yea they are common but harmless hitch hikers; beneficial for the reef tanks. Forgot their name...someone here will surely know.

 

Stomella. I think that is how you spell it but I am not sure. beneificial to your tank and toatally harmless

 

It's a baby turtle!

 

Thanks everyone, stomatella snail is spot on.