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I'm not certain? It kind of looked like a barnacle at first glance, but it also might be a vermitid snail.
A needled nosed plier might be useful for closer investigation of what is inside the tiny cavern. Swirl the snail in a cup of tank water and dispose of the water.
When in doubt, throw it out.![]()
Looks like a clam
It took me forever to find this pic but here is a bivalve that is a part of my Frogspawn skeleton and it looks like the one you have also.

