ID this worm

[rosebud161616]

Found this guy a while back. I would see him in rocks, on sand, in my ginormous colt coral. I saw him in corals too much for my liking so when I finally caught him I removed him. I was moving stuff around yesterday and found another in there. They move very fast and stretch out very long. Any thoughts?

 

[650-IS350]

Polychaete Annelid Identification, or “You Can Always Tell A Bristle Worm… by Ronald L. Shimek, Ph.D. - Reefkeeping.com
http://reefkeeping.com/issues/2003-04/rs/index.php
Worm Hitch Hikers

 

[rosebud161616]

Judging by your third link I'm thinking Syllidae. "The syllids are a large and diverse group of active worms which are mostly found creeping over sponges, ascidians, hydroids, bryozoa and algae or burrowing in the surface layers of silt and are common in protected sandbanks. They pierce the skin of these sedentary animals and pump out the juice. They are common in shallow water forms, and tend to be numerous on hard substrates and soft-bottom sediments."

Doesn't sound too shabby. Do you guys agree?