Feather Dusters taking over

[d.i.y]

Ok rc iam thinking this may be bad for my tank Feather Dusters taking over and my tank is only 6 mo old help http://www.youtube.com/watch?v=INHfnzHYO2Q

[Diva]

I believe those are spirorbid worms. Harmless, reef safe,filter feeders.
Here is a link about them. Hope this helps :)
http://www.melevsreef.com/id/spirorbid_worms.html

[skyshrimp]

Actually seems normal to me, although on small scale they just filter water. No harm done with these guys.

[SushiGirl]

What they said. Not harmful and actually very common in young tanks.