I don't think there is any trick to breeding most ray species. You just need the right pair to make it work. I have one mature male that isn't interested in breeding and two that are, of those 2 one has bred with 2 females but only one has carried to term. The other is trying with another female with no success and is only interested in her. The male that has bred is not interested in her. okay I think i'm confused.lol