Need ID

[Ejb]

I dont think its a bristle worm, has a white diamond pattern on its back. Any ideas?

 

[Ejb]

Bump. Never seen this worm before. I think he may be friendly, I first noticed him when he was very small on a frag and thought he was a bristle worm. Now hes fairly bigger but no damage to corals and what not that I know of. All my rock work is from previous tank so only critters that could make it to my tank are from frags.

 

[Sugar Magnolia]

Have a look here - http://chucksaddiction.thefishestate.net

 

[AlSimmons]

If the worm appears to be smooth then it might just be a harmless Peanut worm.

http://www.reefkeeping.com/issues/2004-04/rs/