Then as far as shrimp, asian caridina (tigers, bees, crystals) would be the obvious choice although that temp is a bit warm for them (they usually prefer low ot mid 70's). Unfortunately, while nerites will surive in softer water, its not ideal for their shells and you will see etching and erosion over time. Malawa shrimp are extremely flexible and would do well and I think that babaultis would also do pretty well, as they seem to do ok in soft or hard water and can take those temperatures. Amano shrimp would be another option but they do not breed in freshwater. They do, however, eat hair algae, other algaes and are easy to supplement and they get nearly 2" which m akes them a good fit for a community tank.