Thejoeybrown
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I disagree brotha. If the cation exchange is full (which store bought Coco is buffered to break the K bond that would lock out Cal) then you do not need to supplement it. Odds are the deficiencies are a lockout.I use RO water and coco so cal mag is pretty necessary. My last grow I wasn't even giving them enough, they started to show deficiencies about a week before harvest so I just started flushing and called it good
I've never ever added it and I only use RO.
If you're using a bloom formula in veg then maybe but mostly for the N boost.
Read about cation exchange. It's a must to work with coco