Check your ph.Are you growing in soil?????Hard water will screw up your ph.Having same exact problem.Stopped using my tap water.Have been using distilled H2O,but starting to get pricey.Attempting to locate some "RO" water.To remedy my problem i flushed with several gallons of distilled water,then 3 or 4 days latter i watered my girls again,but added a centrum vit for women to my gallon of water & fed them.It really did help out a-lot.I was even surprised w/ the results.Good luck