i could never breed the L46 Kupper!
Depends what type of killifish, Notho' species are starting to pop up they are a stunning killifish that spawns in the substrate, in the wild the ponds would evaporate and dry up, the eggs would lay dormant in the soil until the it rains. The nothobranchuius species would have to be the most stunning of all the kilifish. remember they dont live lonf usually upto 9 months some species will live up to 2 years. There are also mop spawners.The most important thing in keeping killi's is to have a glass cover and ever little gap covered! check out some of the killifish forums, they are mostly abroad but will give you a better understasing in keeping them.