What worm came with my coral? ID

[HappyAzula]

I got these pipes on my coral looking like a vein. It just came about 1 week ago on it. Will it harm it and how can i get rid of it? By movement or light, it pulls inside. First pic its out nd 2nd pic its hiding inside.
thanks!

 

[Timfish]

Looks like a small species of feather duster, beneficial filter feeder.