Looks like a very small open clam shell

[Qbmafia444]

Can anyone tell what this is?

 

[saltyfilmfolks]

Looks like a clam shell. Empty I’d say.

 

[Qbmafia444]

It does just don’t know where it came from, I never had any typ clam in tank

 

[saltyfilmfolks]

It could have just fallen of the rock, dead or alive.

 

[Qbmafia444]

Oh yea that makes sense