I'm in the 5th week of flowering and the buds look good, but the leaves are curling up and turning yellow. others are developing bluish spots and curling up as well. i've been leaching the soil about once per week and i don't see any improvements. i don't have any pictures to offer and i don't want to begin fertilizing again until they resume normal growth. does this sound like an excess of deficiency of any nutrient, potassium? please help me.