Need Opinions

[richserpe]

Hello all and happy Humpday

I have another mystery guest in my tank. I suspect Mussel but they usually prefer cold water instead of warm reef tank water. I keep my tank at a constant 78 degrees F. This guy is attached to my rock, black/green and has his shell open slightly and has a little tab on the rear. I’m not too worried about a filter feeder but I like to know who everybody is at the party. Any thoughts?

 

[KrisReef]

Oyster? Filter feeder is correct. I never worry about these and they have not become a problem in any reefs that I am aware of.

They (bivalves) can create problems in the natural environment.