I'm about 3 weeks from harvest....growing a JockHorror auto plant in a Colorado Grow box w/2 Gal reservoir, hydroponics using distilled water. 6 100w CFL bulbs. Ph is good. Can't figure out why leave tips/bud tips are browning. Thought it might be heat burn, so I removed 2 bulbs - no change. The lower buds are looking really healthy , so I'm totally confused. Any ideas are much appreciated. Thanks!