Where are you at in MO? if you age your tap water for changes in a separate container ( aka rubbermaid brute) . You will find your tap water's PH will drop over time on its own.. Rays are big waste producers so the Nitrates produced will be dropping the PH as well...
main thing is consistency...you'll find depending upon what part of MO your in you have more issues with GH levels and nitrates from the tap if you ever think about a breeding program.