having a prob with rust spots on leaves starting on older leaves but moving up to new growth.I'm using Jacks and Cal Nitrate. 3 grams Jacks - 2 grams Cal nitrate -1 gram epsoms-0.20 grams calcium chloride per gallon. in bubblers ph 5.8 to 6.2 temps mid 70's plenty of fresh air Humidity 50 to 60...