Hitch Hiker ID

[Fragged_it]

Ran across this softy with a TON of hitchhikers.
What is next to the sea squirt? It looks like some type of mollusk. Can anyone identify it? I was thinking of seperating it from the rest of the nuisance species and putting it my refugium.

Any thoughts?

 

[twinspots_goby]

a kind of tunicate?

 

[Fragged_it]

I'm curious about the white hitch hiker next to the tunicate.

It has a hard shell and closes when touched.

 

[twinspots_goby]

some kind of shellfish then. musscle or clam?