ID needed on worm / duster

[NewspaperFort]

so this little guy looks like a shuttlecock... and is perhaps my favorite tank inhabitant.



So any help IDing would be of value.

http://s26.photobucket.com/albums/c106/mrchickenrox/?action=view&current=winterinstallment425.mp4


he doesnt have a tube like the dusters... he comes straight out of the rock.
there is a little clam just above it on the rock as well ^_^

 

[rattler]

looks like any one of a large number i have......have no ID on them....

 

[amphirion]

potentially, i think it resembles a young christmas tree worm.

 

[Brokken]

Bispira of some kind. Sometimes you get them all over your sand. Not that uncommon.