I am having a problem I have never dealt with before. I have 4 girls growing but only one is giving me some problems. I run 3 gal pots using gh nutrients. I am using a Growers Choice roi e720 at 926 par. I feed at 1.2-1.4 ec with ph at 5.9-6.2. Temps are 78-82 degrees lights on and 68-73 lights...