Please help identify.

Cyanide Nova

New Member
I don't have a picture, as i can't get a good one. I just bought a tank and some live rock today, and in one of the live rock is a little greenish arm like strand. Almost looks like a tiny tree. When i turn on the light too quickly, poke it with something or make a lot of noise in the water it retreats into the rock. Hasn't come out all the way. Read a lot of posts and it seems kinda like a bristle worm, but I'm not sure if it is the bad kind that feeds on coral. anyone know what it might be?
 
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