PH level down

You need to go to 5.8 going in, and comming out. Will have to shock it with low ph water till it drops. Then it will rebound a few times next few days. So you will have to repeat dropping it till coco buffer is right. Anything 6.3 above you are in root lock out. So shock it down, then run 5.8 thought. If past day 7 on plant finish with 5.8 light nutrition to refresh coco nutrition with cal mag. It is needed in coco grows. You can not over water coco unless it is steady water 24/7. Don't leave in run off when done. I check mine every other day. Coco needs high irrigation for best results. and alway moist with right ph. 5.8 veg 6.2 flower. Good luck