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When do I use the canna pk 13/14? I know it's in the second month of flower but is it in the beginning of the 2nd month of flower? Or? Cause from my nute schedule I would think so? If I'm wrong any input would be awesome

Hey I am using canna coco a&b and canna coco coir I also noticed that they don't have a cal-mag supplement with their line so basically my question to my fellow growers is do i need to use a cal-mag supplement I'm currently under almost 600w of led's from mars-hydro in a 4ftx4ftx7ft grow tent...