not sure what this is but it doesnt look too good.. any ID help would be great.. also thoughts on what to do if it is bad.
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It looks kinda like a small cowrie to me. Really not sure if it is though. They're a type of algae-eating snail whose mantle often covers the top of the shell when it is out and feeding. They can have those protrusions too. The thing that concerns me is that those protrusions seem like they're attached to the polyps, and that shouldn't happen with a cowrie. Does this thing move at all and does it seem to have a hard shell? Weird weird weird...