Towellie.... one thing you might want to try instead of calmag (which, tbh, can bring its own problems) is something called langbienite... You sprinkle 1 tablespoon of this on your soil once a month and apparently you will NEVER have calcium or magnesium problems with your grow... I just got this tip from a friend who learned it from an old-timer grower and my friend says it works INCREDIBLY well... I'm starting this myself today with MY grow that has a bad problem with calcium deficiency... but I just wanted to pass that tip on to you...
Good luck!
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