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this is my first grow and am almost done i think, but my leaves are turning yellow, is this normal?

ok i bought the dynamic duo which ended up costing like 27 bucks, includes the all purpose and blossom booster. but its on the way and i was wondering since im only growing 2 plants with my 250 watt hps, how much do i use per bottle of clean water? and also when i "flush" my plant what is the...