I'm 3 weeks in since flipping to 12/12, I've noticed a fair amount of yellowing to all plants but not too concerned - they've stretched a lot this time so the bottom half of the plant is a fair way from the light.
However one of the plants is yellowing at the top of the plant with brown patches.
Anything else I should be looking at? Manganese / magnesium / nitrogen deficiency?
I've upped feed to 3/4 strength today (Hesi soil nutrients).
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