I don’t think I could grow in soil very well. Im so use to feeding every day in promix. Coco sounds like a great substitute. Do you mix perlite or anything in it?
You can mix perlite in, some people don’t. I chose not to.
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I might try one with harvest hero and one with nothing but coco just to see if I can tell a difference between the two. 
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I have not seen that video but have heard letting ph fluctuate a bit can increase update / exchange of certain nutrients. When I really let my hair down (I’m bald) I may go as high as 6.1 - 6.2.
Most of the better coco brands adequately wash and buffer their coco. With buffering the demand for supplemental calmag is much less providing your base nutrients has enough.
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likewise. I keep it 5.6-5.8 in the res and with drift hit the 6.2. Above that in coco is when I’ve noticed issues 
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