Need help identifying a hitchhiker on a coco worm

[kazeespada]

My coco worm has a hitchhiker attached to it that I can't seem to identify.

It's a small roundish light pink hard mass with a siphon extending out of one end. It retracts the siphon if disturbed.

I have some pictures, but given its small size and location towards the back of the tank, the quality is not the greatest.

 

[Tired]

Hard to tell, but I'd say either tunicate or some sort of bivalve. Harmless filter-feeder, either way.

 

[kazeespada]

Hard to tell, but I'd say either tunicate or some sort of bivalve. Harmless filter-feeder, either way.

I had the same thought, but I wanted another pair of eyes.