Panewbie
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The light green coloring along the veins and edges of the lower leaves.
However based on those fertilizers you should be delivering plenty of Mg if you're following the directions. However I notice there is no calcium or sulfur in either of your nutrient bottles; are you supplying that elsewhere? I am sure you are providing calcium because they would be looking pretty bad if not but I could see this being a sulfur deficiency if not a