? on ph in hydro

i hear you should water at 6.3 ph but im running hydro 1/2'' coco with rockwell cubes is their a better ph for this setup?

how many tims do you guys water aday in useing ebb and flow sistem and watering every two hours?

2 hours is a little much I run mine about 3-4 hours apart with lights on, and a little less with the lights off. As far as yourPH goes bro, 6.3 is a little high in my book. Try shooting for more around 5.5 or so. Your walking the fine line of Nutrient lock-out, with a high reading like that. Try for 5.5 - 6... See what works best for you and your setup.