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    URGENT need assistance with possible nute burn

    So I have 2 autos underneath 600 watts of MH. Distance 24inches from canopy. Cool tube, 6 inch exhaust. Temps around 75-77 with humidity at around 60%. Running ultimate organic promix with 30% perlite. Ppm of soil runoff is 550 and soil ph is 6. I fed them twice consecutively last week with a...
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