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I am growing in a grow tent in closet using SOHUM live soil. Using rainwater with CalMag added. Spider Farm SF2000 LED light panel. All I do is water every other day.
Do you know the pH of your rainwater? It may be that it is outside of the range and creating a lockout of potassium.... the leaves drying out like your photo indicates presents like a cooked dry material. FWIW, under 5.5 could be a source of a problem. Our rain water is very acidic and can etch the paint on the hood of your car
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