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What would cause my PH to go from 6.4 going in down to 4.9 in the runoff? Soil is Roots Organic. It's causing severe nutrient lock out. 5 other plants are fine.

Hi everyone, I'm a first timer who's been lurking for about 2 months. I'm 5 weeks into a soil grow (Roots Organic) and I have a plant suffering from obvious Mg deficiency to the extent that I think I might lose the plant. When I figured out what it was I put some Cal-Mg in the normal watering...