Did you measure KH and pH straight out of the tap, or wait 24 hours and then measure? I'm thinking you've measured the pH straight out of tap because your measurements indicate anywhere from 5 - 11 ppm CO2. (Typical because gas is compressed because of pressurized water lines)
Wait 24 hours and measure your pH again, you'll see that it has most likely dropped significantly as the gas reaches equilibrium with the atmosphere. KH may very well be 15 dKH. Not to worry, won't hurt your fish unless they are pH sensitive. Even then, you can simply add some RO water to bring the pH down without adding any acid to the system.
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