This is hydroponic, the pH was too high so I lowered it and added nutrients to the water. Now that it can actually absorb nutrients the leaf is turning green again starting at the veins which I think looks really cool. It was previously much more yellow.
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I checked again today, reservoir became basic again so added even more pH down. This is why you soak the rock wool to neutralize, because it’s very basic and raises the pH drastically.