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Hi @TPG7541

What you see there with the darker leaf veins and lighter green to yellow areas between the leaf veins is called interveinal chlorosis. I cannot tell from the picture however if the new leaves emerge looking 'normal' and the interveinal chlorosis starts to appear as the leaf matures the likely cause is one of the mobile nutrients.....specifically magnesium. However, if the interveinal chlorosis occurs one the new leaves it likely one of the immobile nutrients....specifically iron. If you are dosing iron but the condition still occurs either insufficient iron is being dosed or the iron is not the the correct "type" for the pH of the water in your tank. Almost all of the various iron types EDTA, DTPA, EDDHA, HEDTA, and ferrous gluconate work fine in acidic water with a pH less than 7.0.On the other hand, if the water is alkaline with a pH greater than 7.0 most of the more common (and less expensive) types of iron like EDTA drop significantly in effectiveness. Is it the newer or older leaves that are showing the interveinal chlorosis? -Roy
 
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