Help identifying this snail (or mollusc?) please


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Hi everyone, I’d really appreciate it if any of you could help identify this. Woke up to find it on the glass this am.

In the tank I have trochus and nassarius snails so thought it was a baby but am not so sure . The shell is split more like a mollusc. It’s about 1cm long
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Do any of you know what it is? If so is it good or bad?

Thanks, e
 
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