The answer is to buy fish which 'like' your tap water rather than have to change the water to suit a particular species.
I have soft water so I keep soft water fish. There are many hard water fish which I like but I know they won't do well in my water unless I add minerals, so I don't keep them. I choose fish from those that 'like' my tap water.
I have soft water so I keep soft water fish. There are many hard water fish which I like but I know they won't do well in my water unless I add minerals, so I don't keep them. I choose fish from those that 'like' my tap water.