It looks like a snail from the genus Melongena. It looks a lot like a kings crown snail that I once had and if it is related its a clam predator. Put a clam on the half shell in there and see if it goes for it.
It's a Triton. I can't tell which one without a view of the aperture. You probably have a better idea of the shape, so you can probably pick it out of this group:
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.