any ideas? runoff ph- 6.2 medium- cocoa coir mixed with fox farm ocean forest in 3 gallon smart pots lighting- 400 watt hps kept approximately 18 inches from tops temp- 65 to 86 humidity- 10 to 40 percent nutes- fox farm used at about half recommended dosage, also use about 2 tsp per gallon of cal-mag tap water run through zero water filter and nuted and ph adjusted comes out to about 6.7 ph the lower older leaves get dead spots on them and the younger newer leaves look pale and yellowish or chlorosisish.