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Over watering in flood and drain tables?

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?

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