What is this?

Not exactly sure what this is. Pic is horrible, but its the best i could do with my sisters cam at the time. Could it be a baby feather duster? I have no idea honestly. I never saw it, bc i had the piece of rock in the refugium as LR rubble and decided to tie a frag to it but saw this pop out of it. When a fish swims by it, it quickly goes back inside its hole. It looks like it has a separate tentacle with a suction cup end to block and close its hole off that it lives in.

 

looks like a small coco worm.....cool

 

coco worm works for me too, if not! it is some kind of worm alright.
good looking to

 

So these coco worms are a good thing to have and are not a pesty species then? Looking at other coco worm pix, i think you guys may be right.

It kinda looks like a smaller version of this
http://www.bonsaidave.co.uk/pics/Marine Pics/coco.JPG

Do i need to feed it? What do they eat?
Thanks for your time guys! I really appreciate all of you at 3reef.

cheers!