potassium deficiency and dont over do it with a bunch you need to be thinking balanced nutrition just up you k a little bit and go from there. Those faded leaves most likely wont come back to much, focus on the new growth. Once a week add your microbes and 5 ml of molasses per gallon on a water day if you want. I understand what your thinking about the cal mag at the 5ml rate I would cut that one out imo you add enough. I see no light burn on your plants