It really does depend on your local water. I'm fortunate to have water that comes out 60 tds, 3 kh, 4 gh, and 7.6 ph. I use blasting sand substrate, so no buffering there, but the driftwood and CO2 bring it down to 7.2. I use nilocg's GH booster to bring GH up to 5-6, and while I know the Ca:Mg ratio is 3:1 instead of 4:1 like the remineralizers do, it hasn't caused any issues yet.
I was also fortunate to find a local breeder on the same water as me, so maybe he did the hard part of getting them adapted to a higher pH than usual. Maybe I'd have better shrimplet survival rates in lower pH water, used a buffering substrate, or did RO with remineralizers, but I feel like trying to maintain those over what I'm doing now would just leave me open to even more instability (or rather, more variables to worry about).
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