Short and simple. Looks like I need calmag, but not 100% sure. Leaves yellowing at tips, slightly curled. A few small brown spots on lower fan leaves. Any advice would be greatly appreciated! Soil mix of 50% organic soil, 25% coco coir, and 25% perlite in 15 gallon pots. Watered when moisture meter reads low end of scale. Watered using RO water mixed with benificial bacteria every other water. 600 W HPS PM 24 hr in a 4 x 8 tent. Unknown strain.