So I'm about 2 months into my grow, I have a midnight kush, blue medi kush, ak-49, and 2 train wrecks all in soil under 600w mh. They have all been topped and given the same water nutes dark light, everything. But the 2 train wreck new growth mostly the edges of the leaves r turning brown and dying, not enough nutes? Or nute burn? I'm not sure exactly, I have been giving plain water for the past week or so to try to flush them, but have seen no improvment, I am thinking to give more nutes when the soil drys? Also growth has slowed a lot.