Help! I have a RES size of my fist in a 20 gallon with a fluval 3 underwater filter. Every time 3-4 weeks elapses I must do a full water change. Not because he is simply dirty (tho that is a factor too) but becuase there are these little fregen white/greenish bugs. Apparantly, they start as like a little circle w/ a tail. Then they fly around the cage.
They can float on water, enjoy the turtle light, and apparantly dont drown! HELPPPPP.!!! I thought Darwin disproved spontaneous generation? I always change the sponge/carbon completely and yet they come back. HELP!