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it's from too much Calcium.. older leaves show excess.. Newer leaves show deficiency. Adding calmag when you are already adding calmag can't help because that's kind of exactly the opposite of what adding CalMag is suppose to do.. Less is more.. Cut out the Cal-Mag.. Possible even look at halfing your nutrient ratios.. are you in soil? if so soil has enough stuff to feed your plant for quite some time depending on soil conditions. I hate CalMag because it solves peoples problems and they think it's calcium/magnesium when 90% if the time it's PH.. your Trio formulas from most companies has everything cannabis needs to grow.. Why add it if you don't have too? why buy another product when it doesn't really do anything? add a tiny amout more floramicro if you really need more calcium.. Read your bottles..
Probably but it could be anything mate.Notice how its in the old leaves and not the new one's.I'd say its an issue that's already been sorted.The first thing most do is add CalMag.It can only help.Add it and make sure you give it plenty of run off.