spikey small worm? brownish red/yellow?

lifted up a rock with polyps on it and this thing was squirming around under it .size of a dime with spikes going one way down the entireworm like an arrow head.i hope its not a bad worm? i took it out rite away and put it in a cup then i took it out to take pictures

 

Bristleworm a member of the CUC, good guy

 

looked kinda weird haha, iv seen bristles before but this one looks different i guess cuz its really small... thanks though!

 

Welcome

 

Could be a fireworm too. It's hard to tell. Fireworms will snack on certain anemones and other fleshy corals. I know they are a potentially good CUC, but I removed all of my bristleworms when I bought my zoa frags just to be on the safe side.

 

My LFS just found a Fireworm in his display tank, wondering what were happening to some of his missing corals. It was nasty, about 12 inches long, gave me the heebie jeebies.