Sorry. Did a quick search. I guess I have Nassarius snails and astraea snails, the nassarius snails stay under the sand bed and only come out after lights out, and hardly ever see them on the glass.
At night I have seen a hitchhicker. Tiny little snail, I think it might be an olive snail, but he's only about 1/4 inch if that. Would be surprised if my puffer hasn't ate him yet.