After I mix my nutrient solution I like to PH up and down the range weekly so that each nutrient is taken in at its optimum PH range. Basically I mix 1 feeding at 5.9, next feeding 6.1, next 6.3 and back down. Coco is 5.8-6.5. 
After I mix my nutrient solution I like to PH up and down the range weekly so that each nutrient is taken in at its optimum PH range. Basically I mix 1 feeding at 5.9, next feeding 6.1, next 6.3 and back down. Coco is 5.8-6.5.