Worm ID - Please don't be a fireworm

[adawg88]

I just bought some "Elite" live rock from a local place for my cycling nano. The rock had all kinds of life on it, including the guy below. He is 4 or 5 inches long. He also has a number (5 or 6 I have seen) small brothers (they all look the same) in the tank. Please tell me this is not a fireworm!!

http://i2.photobucket.com/albums/y32/adawg88/worm.jpg

[coralfever]

hard to tell but looks like a bristle worm.

[greenbean36191]

Well it's definitely a fireworm. It doesn't appear to be a harmful species though. To be 100% sure you would need a clear shot of its head.