I have identified my Big Buds ... I need to stop obsessing on my water and ph. Today my leaves started to curl...I did a partial flush, redjusted the ph to 6.5 and now am letting the ac get some of the humidity out. I am my own worst growing enemy because I tweak and tweak- this hydro kit is simple enough for a 4th grader, yet I'm complicating it. My grow chamber is in a closet, so heat stress may be a cause as well. I am using 8,400 lumens for 6 plants in a small hydro unit.