I would look for small schooling fish that would do well with the pH you have. I will assume your water is suited for livebearer's who need hard alkaline water in order to thrive with ph values between 7.4 and 8.0. I would look for fish that appreciate similar water conditions. Mollies,and guppies do best in warmer water ,something in the 78 to 80 degree range, while platy's and swordtail's do best in slightly cooler water closer to 75 to 76 degrees. This should also be something for you to consider when choosing fish.
Many websites and books ,will give a ph range and temperature range for most fish but one should not expect to keep the fish in either the lower or upper extreme of those temperatures, Fish will always do better in the long term with temps.,and ph somewhere in the middle. Others will often state..."well. I keep my fish at this pH.or that temp and I haven't had any trouble".. I place little stock in emotional aspects of this hobby. My only concern is for the health of the fish and the suggestions I offer are always aimed to that end. It is as it should be, not necessarily the way we think it ought to be .