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  1. Hi all, sorry for the spam but my diesel leaves near the top are curling inwards, and it's nearly ready to harvest. I'm what's causing it? Research suggests light burn, nute burn, too hot, too cold, over watering... Any help would be great! Temps range from 21 lights off to 28 lights on (canopy). Rh sits about 50, not much higher. I could stand to turn down the nutes a little, have backed off the ec (really hard to get my a+b below 1.4). Last few feeds I'm doing 0.9 explode and multi total. pH might have snuck up when I let my big bucket sit for a week.