Rockets and Lyretails
When looking for killifish, you might also come across Epiplatys species, of which the most famous is perhaps the Rocket Panchax, Epiplatys annulatus, and Aphyosemion species, such as the popular Lyretail Killifish, Aphyosemion australe. Their care is broadly similar to that of Fundulopanchax gardneri, but they may be a little more choosy in terms of water chemistry, aquarium size, and social behaviour.
Aphanius mento is a West Asian pupfish species from places like Turkey and Iran, where summers can be very hot but winters much colder. As such, the species has a broad temperature tolerance. Warmer summers will encourage breeding, in which case you could add a heater to bring the tank up to 22˚C or so, but in winter, even 10˚C isn’t going to cause them harm. They need plenty of space and hard water. The males are gorgeous — midnight blue with iridescent spots — but very aggressive, and unless the tank is huge, keeping two males together usually ends badly, so aim for two or more females alongside a single male.