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I have serrano peppers under a grow light and things have gone okay so far but I can't figure out this yellowing issue. It's not over or under watering from what I can tell (left a couple days until droopy) and I'm watering once a week with 4-18-38 mix. I water from the bottom and an on a 12/12 light cycle at about 83F w/lights and ~66F at nights. I'm very new to grow light use and am wondering if there's a problem here than I can try to correct