I can only vouch for what works for me. I have a low-tech 55 gallon tank with very soft tap water. After experimenting for a while I found that adding 1.5 teaspoons of baking soda at my every two weeks water change works great with no problems. I have been doing this now for over two years so I don't really see down side to this.
As I said it works for me.
As I said it works for me.