Worm - name and new growth?

[Reefster]

What is the name of this thing? All i know is that it is called a "worm", but is there an official name?

Is the white part of the tube new growth?

 

[Dturner]

That looks like a coco worm to me.

 

[Smitty]

Yep, coco worm.

 

[Reefster]

Thx. what about white part of the tube? is that new growth?

 

[Dturner]

That would be my guess but I have never owned a coco worm. It doesn't look like anything to worry about.

 

[JustinsReefTank]

It looks like part of it body that tucks inside he outer shell! But +1 on the coco worm!