well I have been growing the same strain witch is a white widow from seed and over the past year ive usualy ran a ph of 7.0 and have ran into a few problems come mid flower with deficiencies so I figured this grow I would switch it up and run a little lower so far they have been just fine only issue was in late veg stage with a cal mag issue but I was able to overcome that and Moshkino I do have one box fan I keep at high speed at the bottom of the canopy to help with fungus knats I never though a fan could cause issues like that..