First you need to determine the pH, as well as the hardness of your tap water. You will get more accurate results if you let a bucket of water sit for 24 hours with an airstone running before testing.
Second, if your pH is 8.0+ out of the tap it is probably quite hard. Hardness stabilizes pH, adding chemicals to drop the pH in hard water will result in the pH coming back up shortly. This is bad for fish, and is worse than them being in a stable pH of 8.0.
If your tap water does test out to a pH of 8.0 or so consider keeping African cichlids, they will love your water. If it comes out considerably lower there is something, probably substrate or decorative rock, that is causing a pH increase.