Get a better balanced nutrient to feed them, get some microbes in that dirt. You have a few deficiencys mg p k. Your feeding it a 5 1 1 a better ratio imo would be a 6 3 4 and get some microbes in that dirt other than hydroguard for dirt. Raise the light up slow everything down and let the plant recover. Proper balanced nutrition. Microbes. proper lighting ,spectrum and intensity Proper watering not over not under. The growmore product will dissolve the dead roots but it wont be available to your plant without the microbes. Dont focus on ph run off. Feed at a ph of 6.5. Get some better microbes for your dirt.