Down on the peninsula(Belmont) tap water is typically KH of 3 and pH=8.5-9.0. I think we are the same water, but not for sure.
The golf course I work at in San Francisco though has a KH of 2-3 and pH of 8.3.
Either way, with CO2 of 1 bps I got the pH down to 7 which is about 10ppm and if you increase the CO2 you should be good, no?
Side note, what is/are your favorite plant/fish stores?