Get yourself a cheap ppm meter for a start, pretty invaluable. plant looks pretty good overall man, just need to fine tune you ppm inputs. even when leaching use a very diluted mix, pure water will give your plant osmotic shock.No ppm meter unfortunately, Running 2 QBs in 3x3, 200watts at about 18'.
Over-fert and PH issues recently. I'm leaning towards plain ph water then see if it progresses.