Looks like consistent overwatering and possibly time to up their nutes a tad, and/or give 'em a shot of unsulfered molasses at 1 tsp per gallon. Cannabis prefers a wet-dry cycle, so give ample time for drying the rootball a tad after a flush, and don't let the rootball sit in the runoff water. Try and get comfortable with the weight of your pots full, and their weight dry. Helps keep ya from overwatering.

I'm assuming you have the headroom for taller plants, since you're going with the big gun. (1000w) Yours looks like an indica dominate strain though and it's flowering time suggests the same, so it will be likely to have limited stretch.
Rusty Trichome Reviewed by Rusty Trichome on . Yellow, brown spotted dying leaves first grow please help! Not sure of the exact strain of clones, I know it flowers in 49 days. Light is 1000 watt mh for veg. On for 18 off 6 2 feet from plant good vent whole room area in 3 mins on 24/7 and good air movement Temp during day 83f at night 76f Humidity steady 45% Growing in FoxFarm Ocean Forest using foxfarm growbig and bigbloom at half strength Watering with reverse osmosis water ph,ed tp 6.3 Plants are at 6 weeks. I have had this problem for ten days and I need to solve this problem so I can go Rating: 5