I'd get a pair of rainbow cichlids (or a single convict), some platys or swordtails, and sit back and watch the fun. The cichlid or cichlids will eat the fry, and the tank will be fun and entertaining. Plus, your PH is perfect for Central American fish.
For South American cichlids, Bolivian rams are hardy, so you could easily do a pair or trio of them, some tetras (many choices), and otos or a single clown or bulldog pleco (both stay small)...heck, you could even add a single angelfish in there, too. That'd be a nice tank.
Or, you could go Asian with a paradise fish, a dozen white clouds, and some loaches (sinobotia if you're lucky enough to find them or hillstream loaches which are more common). Water PH is again ideal, no need for a heater with these fish, either.
Eric