This deficiency most notably popped up right before flower. I thought I had it figured out but I don't. Leaves start Browning at edges, then the leaf starts getting less green. Brown gets more pronounced until the leaf dies 600watt HID Grown in 1 part EWC, 1 part perlite, 1 part RO's green lite (charged peat) 2 parts SSA Currently on week 2 of flower. Feeding 1.5 mL per gal of DG foliage pro with 1mL per gal of protekt. Alternating protekt with calmag Water Ph'd to 5.8 - 6.2 Feeding every 3-4 days pending. Watering without nutes every 3 or 4 waterings to prevent build up.