What are these?

[jfarrar2f]

We recently bought a 125 gal reef tank and have been able to identify everything except these pink tubes that are growing on one of our live rocks? They are soft and a couple have long tentacle/ antenna looking things attached at the top. They don't seem to have anything in them. Any ideas on what these could be? Any help would be great

 

[iDream]

Maybe a tunicate or some kind of sponge?

 

[warvillian]

I believe they are sponges, mine normally appear in the shade on the underside of my live rock.

 

[jfarrar2f]

Ok that helps. I'll do some research. Thanks!