Muddy
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That looks more like a phosphorus deficiency with maybe a little potassium too. If it were cal/mag you would be seeing small, round, rust colored spots all over the leaf. They start like pin holes and get bigger and darker as they go. I haven't read your whole thread but I see you are using teas, so it should be easy for you to up your P and K. But before doing so I would make sure there isn't a nutrient lockout going on. What is the pH of your soil?