You can either fight your water or work with it.You can keep Africans,Livebearers,Goldfish,DaniosRainbows and with the addition of a little salt Brackish fish in your water without having to do anything to your water at all.While a 10 G is a little limiting,a very interesting tank could include some shell dwelling Africans and a school of Danios for some interest.There are lots of other possibilities.Softening hard water without an RO/DI or DI system is isn't worth it imo,but I'm old and lazy!You could think about collecting rainwater to dilute your well water with.Acid rain might actually have a benefit for you!
John