Whats your medium? Im assumming Pro mix if your PHing that high and still doing ok....
Pro Mix PH in should be @ 6.2, coming out it should be around the same....
In Coco, you PH to 5.8 going in, and as long as its not more than 6.1 coming out, I know Im ok.... If it is higher than that, then I know I need to flush because it is starting "Nutrient Lockout" because of built up salts and waste.... However, if it is a Lower PH than what your putting in, Id assume you need to go a little heavier on the nutes... Not too sure though, cuz I use coco..... Its never a lower PH that is the problem, its always the High PH that bites you....
