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Need to know why my top fan leaves turn crispy towards the end of flowering? Using California lightworks SS440 LED, 2 ten gallon pots organic soil mix with perlite, fed GH nutes at half strength in 2x2 closet space under scrog.

Please help I've been flowering for 13 weeks now, flushed with ph'd water last week Bottom of plant looks pretty much ready with lots of orange hairs and dense nugs but towards top of plant still so many white hairs, stretching and albino tips,any ideas ? I'm using California lightworks 440...