when i got home this evening i turned on my tank lights and i noticed this white micro worms about 1cm or less in my tank.. it was everywhere, they were in the glass, free-swimming in some kid of slime.. my tank is crystal clear.. i have double filtration one is biological and the other is a canister filter.. I have a blue light that is why maybe they are easier to be seen than with a normal daylight flourescent.. What are this worms?? are they harmful to my fish?? thanks guys..
