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I have something in my tank that looks like that. Mine only comes out after lights out. Mine looks like a turbo snail with a deformed shell lol. I think it is most likely a turbo, but I could be wrong (I probably am).
This looks like a small Haliotis or abalone snail to me. They also come out at night and are herbivores. Young snails are hard to give a species name to because as they mature their color and shape can alter.