While maintaining a certain level of pH in the home aquarium, you have to take in to consideration where and how these fish were raised from fry. Many of the fish available on the market are pond raised or raised in a home aquarium. Many of the fish you find at the LFS already are accustomed to the pH in your tank.
I have kept my cichlids in a pH of about 8.0 and that includes my africans. They have never seemed to have a problem with lower pH levels even when I moved to an area with much softer water. I believe that while pH is a concern to the average hobbiest, it isnt as much a concern as some would lead you to believe. Pay close attention to the fish as they will tell you what and how much they can handle
Good luck
Les