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This is my first grow and i have a question. I have read that in soil the plant doesn't get nutes for the last 2 weeks of flowering. Is it the same for hydro grows. Thanks for any help. Here are some pics of my grow Jack flash 3 weeks old do they look alright?

I needd help with my first grow. I'm growing 6 Jack Flash plants in a NFT hydro. they are about 2 weeks old and 2 of the plant have started tio develop yellow spots. My PH is 5.8 and they are under 24/0 lighting conditions. I was thinking it is a lack of magnesium but i would like to hear what...