Some type of bivalve

[BWV1056R]

 

[El_Guapo13]

Looks like it. Also is that a tiny bright red feather duster below it?

If you need more specific info on the bivalve, hopefully someone in #reefsquad can help. Cause I have no experience with those critters.

 

[kireek]

A slipper limpet.I believe.

 

[BloopFish]

Looks like a mussel, which can come in various colors other than the black ones that are typically consumed, or just another type of bivalve.

 

[DSC reef]

If it doesn't have another valve then I'd say slipper limpet. If there are two valves then it's a hitchhiker bivalve. Harmless and non photosynthetic

 

[User1]

If it doesn't have another valve then I'd say slipper limpet. If there are two valves then it's a hitchhiker bivalve. Harmless and non photosynthetic

Agree. I went through a similar issue and someone told me the same in not so indirect terms I have a bunch of them in my tank. Not sure if they multiply but they have yet to harm anything.

 

[BWV1056R]

Looks like it. Also is that a tiny bright red feather duster below it?

If you need more specific info on the bivalve, hopefully someone in #reefsquad can help. Cause I have no experience with those critters.

Yes that is a red feather duster, I have them all over my tank