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issue YELLOWING help

I'm quite new at this and would like some opinion/advice. I have yellowing leave on about 20 of my 200 plants in my grow tents. I'm bottom watering as the plant dries out. I've used a mild solution of Miracle Grow liquid fertilizer with 15 nitrogen. Any help appreciated.
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What kind of soil did you use? Normally there's enough nutrients in there to keep the young plants going for at least six weeks. It might be you gave them fertilizer to soon? The salt build up in the soil from to much fertilizer can result in yellow leaves.
 
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