Invertebrate Identification

[tim_keown]

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[tim_keown]

I am having trouble identifying a small, swimming green worm in my saltwater aquarium. It is about an inch to 1.5 inches long. It is apparently nocturnal because it swam around frantically when i turned on the lights in the morning and then burrowed into the substrate. It swims like and eel but also has lots of small, thin legs lining each side that aid in swimming. I'm sure he came with the liverock because i certainly didn't purchase it. If anyone has heard of this PLEASE let me know.

[LockeOak]

I've seen small, pinkish worms in my tank before... perhaps they're a form of larval bristleworm?