Identify worm please?

[mooch1982]

http://www.reefcentral.com/forums/showthread.php?t=1939405

[LeslieH]

A good close-up pic would be the most helpful but I guess it hides in the rocks most of the time. It looks smooth and I suspect it's a ribbon worm (Nemertea). These tend to be predators on small motile inverts like other worms.