Resolved What in the world is this?

I was looking through my tank with a flashlight just now like I do every night, except this was later than usual and I saw this weird worm like thing, it was about 6 inches long stretching through the rocks and is attached on the bottom there to the rock. When I put my light on it, it shrunk down to almost a 1/4in and looks like a closed zoa now. I'm reffering to the long thing in the picture in front of the bryopsis (i know, workin on it, but controlled). Any ideas?

 

looks like a worm to me . hard to tell

 

Looks too long to be a peanut worm... maybe palolo?
http://www.3reef.com/forums/id/weird-worm-74724.html#post724016

 

Its attached on the bottom to the rock. Its definitely some kind of weird worm and the size changed quite a bit, shrunk half a foot down to almost nothing. If its a peanut worm should i be worried? what can i do to get rid of it. Its been in there a month cuz that when i got that particular piece but i just saw it now and it hasnt caused any problems, yet.

 

Bump?? Peanut worm? Reef Safe?

 

The fact that it leaves one end attached inside the rock leads me to believe it's a peanut worm. Tie A Yellow Ribbon (Worm) Around The Old Reef Rock... - Reefkeeping.com

 

Yup. Peanut worm. I have a ton and have never seen them do harm.

 

Looks like a peanut worm to me too.