wats up killa, im using the grow big for soil use.and my ph is fine i checked the runoff and it was about 6.5 range i think i just fixed my problem. What i just did was turn the mh back on and got really good ventilation up im talkin ac to the tent! lol and the nasty air outa the room. so im excited to see wats going to happen ina week ill probably veg for 2 more weeks then put into flower mode!