Could some one please help

[Marsham71]

Hi all, It has appeared on the under side of my zoa rock it pulses the whole lump moves it doesn't eat the Copepoda it just appears to breath do any of you brainy lot know what this could be I poked it with a stick it wouldn't move lol but it's still doing its thing

 

[Scotty Buttons]

Looks like a tunicate, generally there harmless filter feeders.

 

[WV Reefer]

^ I agree. Tunicate.

 

[Marsham71]

Thank you