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............I'm blessed/cursed with ultra soft water( Ca:30 Mg:0 dKH: 2.5. So I get the choice of keeping things in the low end or dosing them up. I just didn't know what people think.............../That's not very soft. My water is about half of that with a dKH of< 1. I used to use the standard 3:1 ratio of Ca to Mg. For the past few months I have been dosing equal (by volume) amounts of Ca, Mg and K2SO4. The only difference I see is less GDA on the glass. I keep my water around GH of 4 to 5 as I keep mostly tetras.