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Thanks for the insight dgc! After scaring myself on my first indoor grow, I’ve come to the conclusion that the yellowing lower leaves is completely normal. I watered today, tested the runoff, and the pH was 6.5. Water going in was 6.9. Now i’m just fighting the humidity. It’s been warm and rainy all day, leaving the humidity at 71° in the lung room, 67° in the tent.