coco ph

got a coco brick added 5.8 ph water to expand ,after 5 gal flush with h2o @ 5.8ph,[7 gal smart pot], run off ph is staying around 6.5/7.0,how do I stabilize ph in coco , at 5.8-6.0 ?

Hii So I had found a seed in one of my bags and decided i'd give it a try. To my surprise it germinated and I had coco coir sitting around from a different grow. In the beginning it went okay, near the ending of the seedling stage I started having nutrient issues(using fox farms 6-4-4 1/2 tea...