White tube worm

[Franco1024]

I put my acans on a new rock together and now I found these white tubes on the skeleton. Any help in ID would be much appreciated.

 

[madmarks]

It is hard to tell exactly what it is, but there is one in profile that looks like a pineapple sponge.

 

[ying yang]

Yeah one on left looks like pineapple sponge but picture blurry

 

[Fishko]

yeah they look like pineapple sponges,