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Top leaves only showing the issue, and is affecting the bigger/older plants. At first I thought it was too much Nitrogen due to the burnt tip but then remembered the leaf would be dark green rather than light.

Being the top of the plant with the issue makes me think it’s a none mobile nutrient that is lacking, and so I’m drawn to a magnesium deficiency?

Hopefully that’s correct but wanted some input before I give them something they don’t need. Thanks guys and keep up the good work.