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No shell on back, they look like slugs.Clear pics of the back/shell would be helpful, but from what I can see it looks like either Stomatella snails or limpets (both of which are considered good CUC).
To give an idea, some snails have very tough to see shells or they cover their shells with their foot (like fleshy limpets, cowries, elephant slugs, etc.). Some examples of Stomatella snails that may help:No shell on back, they look like slugs.
Stomatella Snail -![]()
Very good hitchhiker. These guys are a great clean up crew member. They can be very elusive and most commonly found after lights out and are very fast moving. They feed off different algae in the tank.

