So in my first hydro run i suffered some leaf tip curl, but i chalked it up to over feeding, especially N. I also had some other probs... Anyway, this 2nd run is off to a way better start, but ive got the leaf curl again. i know its not over feeding or too much N this time. My ppms have only been 300 this 1st week, with way less N. In fact, i know i have to bump it up because the new leaves are much too light green. So the leaf tip curl must be from over watering??? I flood every 4 hours... Over watering in flood and drain tables? May 19, 2019 at 01:54AM Read more about this fix