Most of the varieties in the gardneri group are fairly easy killies to keep. If you can raise flightless fruitflies, that's one of their favorite live foods. Most will eat flake pretty well, though. There are a lot of different populations of gardneri, with different colors and markings.
Even though gardneri males aren't very aggressive, it's a good idea to provide some cover in the way of floating plants or spawning mops for the female- better yet, get a trio if you can.
Make sure the tank is covered well- they're jumpers.
A long time ago I worked with a woman from Nigeria, and I took one of my killie books in one day. She knew of a lot of the small towns and areas that the fish were collected from, but had no idea that such fish were lurking in the puddles and ditches. Just like us and native fish.