Large black worm

[Reefgoat]

So last night I was quite startled when I saw a fairly large black worm with tentacles peeking out of one of my live rock I had just been moving around. It looked maybe a bit larger around than a pencil with multiple short tentacles. It doesn't look like the pictures of broistleworms I have seen. The light wasn't too bright at the time, but I'm pretty sure it is pure black. I wanted to get a picture, but I can't even get a second good look at it. Anyone have any idea what it might be?

[Salty Reefer]

Terebellid Worm?
http://www.wallawalla.edu/academics/departments/biology/rosario/inverts/Annelida/Terebellidae/Thelepus_crispus.html

OR

Eunicid Worm?
http://www.njreefers.org/showthread.php?60571-live-rock-roots-mystery-live-rock-hitchhiker

[Reefgoat]

I appreciate the links. It looks a little bit similar to that eunicid worm if it was pure black. I am going to try to get another look at him, maybe I'll bait him with a piece of food. He scared the crap out of me at first but he actually looks very cool so I don't want to remove him if I don't have to. Maybe I'll get lucky and snap a picture.

[Myka]

Some fireworms are quite dark, and if dimly lit would look black.

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