I bought some clones about a week ago and since I have put them in my tent three of them have started to develop yellow spots on the leaves. Its been a couple of days and it hasn't gotten much worse but worried that it might affect them later. I use worm castings as my nutrients since I am attempting to create a more organic grow. I have 9 plants total in a 4x2x5 with a 600 watt light and a 50 watt light both LED. I have steady airflow in my tent with ventilation. I don't know what could be the problem since I haven't seen bugs and feed them and water them when needed.
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Yellow spots
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