Hoooboy..
Killies breed in a lot of different ways, so you pretty much have to go by species, or Genus anyway, to discuss their particular habits. Some of them also breed in different ways depending upon the situation in their tank. The American Flagfish, for example, spawns in at least 3 very different ways in response to whatever's the most handy.
Some dig pits, some lay on plants, some scatter. Some breed many times, but some only once. Some like good conditions, and some breed when things are going bad and it's their last chance.
I guess it would help a lot if we knew what you had, and why you think they're ready to spawn.
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