whoawhoa

Hi, guys, any suggestions on how to handle those nutrient issues on Lady #1? I still couldn't recognize what is the problem with her, there are brown/bronze patches on some leaves, lowered the pH and increased P and K, but no success. My tap water is around 160ppm and I'm also giving them 1~1.25ml/L of Cal-Mag, should I give them less cal-mag? I don't understand fully the relation between Ca, Mg, P and K, if anyone could point me some good articles, it would be wonderful