As far as freshwater goes, it's more important imo
to have a stable pH vs a specific number. The pH chemicals are a waste of money, I would just do a 20% water change once a week for the next couple weeks with no pH chem. Then from then on out, it will be 1 less thing for you to worry about.
I would go buy a bottle of Prime from petsmart or petco, use that with your water changes, and store all your other chemicals away.