Hi! some brown starts coming on leaves after flush...

Burning from being fed too much..........flushing has released built up nutrient salts from the substrate. At this late stage there is nothing that can be done to "fix" this, just ride it out until harvest, then enjoy. There is no need to drown your plants with gallons of water as a flush, just give plain water and in normal amounts and at normal intervals for the last 10-14 days before harvest, and the plant will flush itself naturally. Next grow, ease up on the feeding a bit, the plant is very dark green and showing burned tips.........a sign of over feeding. Also, having a diary helps enormously when you want to get answers from people..........the more we know about what you may or may not be doing, the more precise the answers can become.