Your GH and KH should be fine for most plants and fish, IMO. If you feel like your water is too hard, you can cut it 50/50 with RO water from the store. My local Meijer has the jugs you can fill right there which cost $0.29 a gallon if you have a container for it.
The definition of insanity is doing the same thing over and over again and expecting different results.
- Rita Mae Brown