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Not an expert but I did look into it a little. Google is a good source btw. It's a process to hatch them and I believe the breeding part is easy and left up to the fish. As for getting the eggs to hatch you have to remove them and put them in some sort of soil mix(again google can help) and letting them dry out. After a while being dry you slowly wet them to hatch them. I don't think this applies to all killis only certain types.