I am by no means an expert, but it looks very similar to the snails that I have been pulling out of my tank. They have been feeding on my zoos and have done a number on them. Or, it could be an innocuous snail???? Below is a link that might be helpful. Good luck in the identification, I hope that it's benign.
When it's my tank and I have a question like that and a picture like that, I still go to Dr. Ron, in spite of all the craziness that went on here. Email me if you don't know how to find him.
But to me this looks pretty simple ... trochus sp.
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