I'm pretty sure they are Limpets. They do have a hard shell. I only really see them on the glass, although I'll assume they are in other parts of the tank. From what I've read they are not destructive. Maybe just a nuisance as they seem to reproduce easily. Any additional info is appreciated. Thanks.
I have a ton in my tank and they don't cause issues that I've noticed. Seem to do a decent job of keeping the rocks and glass clean. There are some that can be destructive though.
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