Coco, calmag & flowering

I am growing in coco using ro water, GH flora trio and CaliMagic while roughly following the nutrient schedule from growweedeasy.com. On their schedule it says to reduce the veg amount of calmag by half when starting to flower and keep it there until harvest. I'm just wondering why decrease the calmag, is it just that the plant uses less of these minerals when flowering?

Thanks!

never heard of that.

That's why I'm asking.

You don't need cal-mag when using GH flora. The "micro" bottle's main ingredient is calcium nitrate already.