Maybe too much light then? I have plants that if they get too much light, they blanch out. Maybe try cutting the lights by a few hours a day and see what happens?
14 hours a day, try cutting it down to like 10?
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I don't think its to much light. My plants on the bottom are turning light green too. I order Seachem Flourish Excel 500ml. Hopefully it help. I just think I have alot of plants. My plants just need more food.
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