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I am growing in 5 gallon pots with ocean forest soil with RO water. I have vegged them for about 2 months in the 5 gallon pots with my water pH’d at 6.3-6.6. I have not given them any nutrients at all. Although, I did have to water with 62 degree water for about a week. I have been giving them around 2 red cups of water every morning. Five of them look healthy and green & the other five’s top layer of leaves are light greenish with light yellowish blemishes throughout the leaves with purple tips. Can anyone tell me what my problem may be?? Thanks for your time!