I have 2 white widow that are a little over 7 weeks and 6 weeks. One is in Fox farm ocean forest and the other is in Fox farm happy frog. Temps stay around 75 with light on and 65 with it off. I water when the pots get light. Im pretty sure I have a magnesium problem. I haven't been letting enough runoff when I was watering so I had some buildup. I did a flush on her and got the runoff down from 1800 ppm down to 700 ppm. But my issue just keeps getting worse. I don't know what to do. Everything was going so great, had no problems at all and then boom I switched to my 400 watt hps from my 400 mh and topped her and then next day I noticed the problem and its just getting worse.. I don't know what to do.. It's got almost all my fan leaves in bad shape.. PLEASE HELP!!