What is this?

[TopherNAlaska]

what is this growing on my live rock? Hair Algae? It kinda tubular. I attached a photo

 

[jay0705]

Not alage. Almost looks like apatasia, but generally thats more single. You can see the individual nem. In your pic it seems a big glob

 

[bang guy]

It's a Colonial Tunicate - a type of Sponge.

 

[jay0705]

Really??? Hmm learned something new

 

[deejeff0442]

Beat me to it .looks like a sponge