Quote Originally Posted by DreadedHermie
Possibly fungus gnat larvae? (Have you seen any adults?)

If that's what they are, I believe the organism in "mosquito dunks" is effective against them. (Bacillus suppin, I think...)
Yea, they're larvae, that must be it. They're ON TOP of the water, not swimming in it. Haven't seen any adults. My only problems in the past have been spidermites and powdery mildew. I still have not gotten rid of the spidermites, but I have them under control. I am just in the process of graduating some new girls after harvesting this morning. I've pumped out the nutes, but am not loading new girls into the system until I know what I am fighting. If it's some kind of a larvae, and I pick up some mosquito dunks, will it show me directions on how to use it in hydroponics? Is it available at grow shops, because I use a nursery supplier that doesn't know much about hydroponics.

SN