I tested my runoff cuz my plant has a mag deficiency and it is around 6 with using water that is 7 so dose this mean my soil is around a 5? What can I use to PH up? I have normal PH up but don't want to kill my plant as it is in roots organic soil. My stalk, stems and under sides of my leaves are purple and now some leaves are getting yellowing and purpling on the tops of the leaves with a little bit of dead spots on some. Do I just use baking soda?