Sounds very similar to mine. I keep livebearers (platies, guppies and a couple of less common ones), peppered corys and bristlenose plecs. All seem happy in the water and breed/spawn frequently. The only ones whose fry I have not been able to raise are the corys- theirs always gets eaten. I do keep a bit of bogwood in most of my tanks, which brings it down slightly. Try to get fish locally, so they are already used to what you have to offer.
Dizzied's suggestions are good: livebearers, rainbows and African cichlids are the three categories that spring to mind as actively preferring this type of water. Danios, hardy corys, hardy plecs probably don't mind.