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My plants were exhibiting what looked like early signs of a potassium deficiency and it was the day before a scheduled water change, so I figure that is what the problem is. I grow hydroponically in rockwool, and needed to just top off the reservoir with fresh water to bring the ppm down a...

Sorry, but I lost my digital camera a couple weekd ago, so no pics. I grow hydroponically in 2 gh ecogrowers. Day before yesterday some of the oldest plant leaves began curling under just a tad and a little yellow/spotty/brownish. I checked the ph and ppm. Ph was okay, ppm was a little high...