i use megacrop all in 1 nutrient can be used thought the plants life it has all sorts of nutrients inside iam at about 1200ppm rating when i feed and at about 6.4-6.5 ph , yesterday i noticed the brown spots and thought it was a cal mag issue also so i fed her water and some cal mag seprate at a ppm of 300 but the problem persists today i have fed her as usual but added a little more calmag to my megacrop feed and see how she goes today if its not helped i think it is a ph fluxuation like you say what would be the soulution to that fix
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