What is this hitchhiker?

[toadman]

Need help identifying this little guy on my pectinia. Been in tank for months in noticed, seems pretty happy. Shell Looks mussel like. I’m seeing a lot of eyes though making me think scallop. Thanks in advance.

 

[Rocks reef]

It looks like a small bivalve of some sort. It's pretty cool though! They are great filter feeders.

 

[Gumbies R Us]

@ISpeakForTheSeas