tube worms???

[Snappy]

I have some odd looking worms? that come out in the dark and are very light sensitive. They extend out of the live rock sometimes up to about 2 - 2-1/2 inches in what looks like a tube a little less than 1/8 " wide. They have a bit of a greenish-blue hue but are more transluscent and with-in seconds of light hitting them they collapse and shrink back into the rock. I had a pretty good look at one the other night (about 4 seconds) and it looked like a straw siphoning silt off the bottom, but not so stiff as it can bend itself. I have only seen 3 so far but I have no idea what they might be. Does anybody have any idea what these things are?
Thanks,
Greg