Hitchhiker on Hermet crab

[Newlyreefin]

Found this on an empty hermet shell in my tank. IT moves slightly even with all of the flow cut off. any idea on what it is? It is tough to get a pic of, but it almost seems to have two small arms that move and pulsate slightly.

 

[reef lover]

Tunicate maybe

 

[KJ]

Tunicate.

 

[Newlyreefin]

awesome! thank you both