ID this black snail/nudi looking creature with shell

Curt2199

New member
Found it creeping along my rock completely flat and I thought it was a sponge until I blew water on it and noticed a shell in the middle under the tissue. I pulled it out and took sump pics. It's in my sump until I can ID it.

If it's a sponge eater will it go after my orange tree sponge?

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