my plants are really struggling leaves dieing off and yellowing all over they are in flower and flowering ok put started at bottom leaves and working its way up. I am at a PH of 6 after nutes( calmag, liquid Karma, & problum) my ppms are at 920?? I can't figure it out I am using arrowhead water please look at this chart and see if you can tell me if this water is like poison or something??