Hard to tell from the pic, but it looks like a marginellid, either a Prunum species or something in the same subfamily. Can you crop the original pic and repost it so that most of what you can see in the pic is the snail? If it's a marginellid, it will be a predator/scavenger, but shouldn't be much of a danger to the macrofauna in your tank. Does it looks like this?
Just found your other thread with the additional pics. It's definitely a Stomatella snail, not a marginellid. It's probably either Stomatella varia or Stomatella impertusa.
They're great snails to have. If you have crabs (not hermits, but regular crabs) then put the stomatella in your fuge or they may be eaten eventually like mine were.
If you have more than one they'll likely reproduce for you
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