Red Planaria Flatworms. You do want to get rid of these before they reproduce and get really out of hand. If the numbers are already high said:Thanks Matt.
That's what I was thinking. I thought I read something about them but couldn't remember. I don't no where they came from. Must have been on a few new pieces of rock I bought. The coraline has had some die-off since I've noticed them. I'm not sure if they eat the stuff but I guess I need to treat the tank fast before I get too many more.
Thanks - Jeremy