For growing in soil your ph is low.....it shoud go in and come out between 6.2-6.8 for soil. Edit: I see you are in coco so forget that last remark.

I also remember Stinky talking about those grow bags and saying they are not meant to be be moved around......it breaks the grip between the soil and the root because the bag itself is flimsy and not solid. You are supposed to set them somewhere and not move them around. That may be part of your problem as well.
Weedhound Reviewed by Weedhound on . Still fighting Yellow w/brown spots I am hoping someone can help me before this poor plant dies. The stats: Plant was fine prior to transplant. 4 week veg (mother) 400 W halide 20" away Day 74 night 66F Coco / 20% perlite in 7 Gallon grow bag. Well water P.H. 5.6 and cond @ 23 ppm Rating: 5