I was just reading over this since thekoimaiden linked me.
I am only just a sort of novice killifish owner myself, but I do have experience with breeding and keeping some of the more common species available in Australia.
Aphyosemion australe (either gold or chocolate variant), aphyosemion striatum, fundulopanchax gardneri (n'sukka, udi-berge and scheeli), epiplatys annulatus, chromaphyosemion biateniatum lagos and aphyosemion poliaki are all killifish I have owned at some point. Unfortunately, I had a bacterial infection come and wipe almost everyone out, but I am steadily trying to build my numbers back up.
If you have any specific questions I would be happy to answer them. I keep killifish in a community tank with rainbows, blue-eyes, microrasbora kubotai, celestial pearl danios, sparkling gouramis and a very peaceful male betta, and they do fine in that setting. My bigger killifish does try and fit all new tankmates in his mouth, but once he realises they are not food he leaves them be.