It's funny you say it could be a bristleworm. I don't know if you saw my post here a few days ago, but while putting the rock in the tank I hurt my hand on something and a lot of people told me it sounds like I touched a bristleworm. I don't think this is a bristleworm though, it's very long and has a white body. he program I used to use to load photos has shut down, so here's the link to it for now, let me know if it doesn't work and sorry the picture isn't very good. The one circled in red is the big one that I saw and the one circled in blue is the little one that looks pretty dead now.
http://community.webshots.com/script...ecurity=uROBKB