re-pot it into a larger pot, with plain,simple potting soil ... do not feed it for two weeks, clear water only, NO piss ... let it dry out completely between waterings ... looks like Pythium Wilt damping-off damage to me ... run lights 18/6, and the dark hours mean dark hours ... the plant will try to grow by itself, stop trying to do so much with it ... like a lot of growers, you're overwatering, overfertilizing, ... just forget the nutes for awhile ... keep it SIMPLE ... :smokin: