Hey there darox I just wanted to add to my answer, I mentioned the affected area being new growth areas. This can also be associated with iron deficiency as it typically is centered at the new growth zone. However the new growth typically comes in completely yellow and then slowly turns green from the tips. Theres a product known as "calimagic" which has your calmag but also has iron in it, I've heard many swear by this product. I hope you can solve this mystery, yellowing leaves are such a pain as they can indicate so many different problems.
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