Cal-mag deficiency

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I'm in dwc with ro water.
I've had a cal-mag deficiency, my stems are all purple, and im getting Brown spots. I've been starving them of magnesium and didn't know it. I was only doing 150 ppm cal-mag.
I recently gave my plants 400 ppm straight cal-mag. The Ppms are going down a couple points a day and the ph is going up one point a day and the plants look better. Oh and she's drinking a gallon of water a day which she wasn't doing at first. My question is, since the plant seems to be doing perfectly at 400, should i add nutes on top of my current ppm? Or should i bring the straight cal-mag ppm down. And then add nutes to bring it back to 400 ppms? I'm wondering if they have a certain threshold for certain nutrients. Or does cal-mag stand on its own. Can a plant only take a certain amount of nutes, but a lot more cal-mag. Or just a certain amount of everthing?
 
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