OK pretty sure I have Potassium (K) Toxicity Magnesium (Mg) lock out- in 4th wk of flower, have 10 plants 5 of which showing this problem all are indica prominent strain.
800wat HPS, 50% coco ,25% perlite, 25% vermiculite, 3gal grow bags. Using General Hydro Floro 3part. Waste to drain. Read...