Avoid temps over 75°F during summer ,they shun excessive heat .Make sure your aquarium water is properly filtered and provide plenty of aquatic plants ,Java Moss and Elodea canadiensis are a good choice.
They require at least 10 gallons of water per adult animal and are not too careful about water quality ,they can live in the wild in polluted water or quite salted water too.
Make sure they have enough to eat ,they are really voracious .You can offer them live crickets ,waxmoth larvae ,earthworms and even bits of chopped beef heart ,they like it.