Worm is tank.... Is it harmful?

Does anyone know what this is? Is it harmful?

 

I can not make anything out from the images. Hopefully this link will help you ID it. Most worms found are harmless though.

Worm Hitch Hikers

 

i can barely see it, but looks like a peanut worm, they are useful and cause no harm...only if that is what it is...again i cant see much..

google image peanut worms and see if it resembles it....usually they dont come out much during the lighting periods of the tank....but seem to come out instantly when the lights are out, or you can see a few as soon as the lights turn on


also check bristleworm or fireworm....fireworms need to be taken care of

 

and coralline beats me to it...

 

hysterical ! ;D lol