White tiny worms in aquarium Please Help!!!!

Someone Please Help . I have discovered that my fishtank has hundred's of
tiny white worms crawling all over the place. Especially on the glass. They
are about 2 milimiters long, some are ven smaller. Is this a desease or
it's normal?

i have 55 gallon tank with two plants and two porus stones. Adeqate amount
of gravel. In terms of fish i have two oscars, one algae eater, two catfish
and one parrot. PH is neutral amonia is 0.

I would really appreciate your help.
regards

Alex