Nick, Sac tap water is extremely soft.
American river water basically.
A few areas might get other source, but not likely.
East up 50/80, same deal, super soft, you need GH booster.
Do a large water change, say 60-70%, then dose after.
Most of the issues once you add ferts: CO2.
So true, i live in folsom, i think we share same if not similar water. Although API test kits aren't accurate, fact that they change after the first drop for testing GH and KH leads me to believe I have very soft water.