Mystery Worm...???

[krissyfish20]

Hey!
I recently (in the last month or so) discovered a 'worm-like' creature in my tank. He is in my rock towards the back and I'm not too sure what it is? It looks like there are a whole bunch of tentacles coming out of one hole, and they wrap around pieces of rock and the polyps attached to the rock. There are maybe 10-20?? tentacles reaching out from the one place. The tentacles are clearish-white with dark red stripes down them, and are very very skinny. I did some research and came up with possibly a spaghetti worm??, but I'm not really sure and couldn't find a lot of info on these or at least pics of them to compare with my guy. I tried taking a picture of it but none came out clearly enough to see this thing. It doen't seem to be harming my tank at all, but I'd love to know exactly what it is. Any ideas??
Thanks
Krissy