The basics of killifish maintanance are explained here
Tips and tricks for keeping and rearing fry.
Can I keep killies with... ?
Exmaples of what you can and not nor keep killies with.
Adpatation of pupfish to fresh water by Thomas M. Baugh. Abstract. - The Salt Creek pupfish, , is adapted to fresh water in aquaria
for all the fish
Here you can get some idea of how people keep killifish in their tanks in a variety of setups.
Various parameters of water chemistry are discussed here.