If you look at two of my pics you;ll see that my upper cola leaves are curling down like a claw. There black domino under 400 watt hps, using gh three part with big bud, good ph, good temps, and good exaust. What the hell could it be from? I flushed the bad one and haven;t fed her any nutes for a week to see if it was over fed. No signs of relief yet. I thought it could be too much nitrogen, but dont know.