doomba, put a teaspoon of epsom salt (not heaping) in a gallon of water, dissolve it well, then give the plants that. after that, only water when the soil gets pretty dry. I don't know the fert you're using but I'm guessing that you could use a microfert booster. General Hydroponics makes one. It'll probably work just fine for a soil grow. It's not pH. You're low on magnesium.