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Might also be a fleshy limpet (note the fleshy ring surrounding the hitchhiker). Stomatella snails and fleshy limpets are both beneficial grazers.Looks like it's probably a Stomatella. Good guys. Mine actually bred in my aquarium. I had two - a large black one and a medium white one. Now I have at least a small black one and two small white ones and occasionally I see the larger black one still.