Man, I am having some SERIOUS issues with this. It didn't start until I started Bhodi seeds but now that I think of it, I have the plants close to the leds, but they are the viparspectra ones which aren't that powerful. The part closest to the lights are fine but I have TERRIBLE calcium/phosuphorus type deficiency issues and I use FF soil. I use Cali/mag with every watering and fert every other watering. Never had this issue until I started elevating them to get more light. When on the floor level, they seem perfectly fine, they are ALL experiencing the same definecy symptoms even though I flush and triple check the PH runoff, I get the same results every time. The only difference is that I have elevated them closer to the lights which I never thought was an issue since the upper leaves showed no signs of light burn/damage. This may be my problem.......it shows up as a nitrogen deficiency first, then the brown spots and purple stems and crispy leaves, moving from bottom of plant to the top.....every time.