With that PH, you might assume that your water is on the soft side; however, my PH is 8.6 out of the tap and the water is just barely in the hard range. Since you don't use a municipal water company, testing the water yourself or having your local fish store test it for general hardness and carbon hardness are your only options. Since these are things that are pretty much constant, having the store test it for you could save you a little money. Naturally, a good test kit for ammonia, nitrites, nitrates, and PH is a good tool to have. The API Freshwater Master kit is what I have and is the most suggested product here on TFK. If your water turns out to be soft or just slightly hard, many of the South American fish fit that chemistry. You might search around on the internet and see what strikes you. You could make a list and then check it against the fish profiles provided here.