so my local shop is out of cns17 for coco but have the hydro formula and after looking at botanicare's website it appears hydro has 1% less calcium and 2% more K. can i substitute hydro for the coco formula and just bump up my calmag or do i really need the coco formula?
I'd run RO filtered water with 5ml Cal-Mag+ to 15ml CNS17. Don't go over 20ml CNS17 during veg or you may wind up with cation issues due to the excess Potassium >200ppm. Should work out fine.