Strange shell appeared in tank

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KakapoRhino

Aquarium Advice Apprentice
Joined
Jan 21, 2019
Messages
10
I was just looking at my tank, and I spotted a strange shell in there. I didn’t think it was anything important but then it started moving. I’ve never seen it before, it’s really small. It’s kind of cone shaped, and it’s white. It also keeps trying to bury itself underneath the gravel.
Any ideas what it is?
 
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