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A picture would be a big help but is it in veg or flower? If its in veg you can mix up some Cal/Mag and Epsom salt and do a foliar spray, either way I would add more Cal/Mag to the mix, PPM 's are less important than what ever it takes to make a healthy plant. I keep my PH at 6.1 and I dont remember the last time I had a deficiency
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