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Early signs of mag, by the banding on the leaf margins. N def as well from that little leaf guy at the bottom. It is looking like you need to feed em more. I'm not seeing any tox and your tips aren't even N burnt. The nutes you are using are a 2-5-4, which would explain the need for more Nitrogen. Also, organic nutes take a week or so to break down, so you've got to think a week ahead. Also, 6.7ph is a lil high for organics, shoot between 6.2ph-6.5ph for your soil. The more food and microbes in the soil, the easier it will be to maintain the PH of the soil. I'd use a fert with some water-soluble mag in it for instant relief, and add some more N to your regiment.