I was cleaning my tank, and when I turned over a rock there was about 6 of these under it. the rest of them went back into the holes before I could get my camera. Anyone know what it is?
You got yourself a bristleworm ... probably a juvenile. Nearly all bristleworms are harmless and they're inevitable hitchikers (everyone's tanks has hundreds of these).
I have read up on the bristle worm, and most people say that they are bad and will kill thing in my tank? But they say their are a lot of different kinds of them, and some are benificial? does anyone know if I have the good ones or the bad ones , what I should do?
They are scavengers. They eat detritis and left over food. When I feed my tank I have literally hundreds of them come out of there holes and hope for a little morsel to fall there way. 8)