If your has a bubble nest and the female is gravid then they're both ready to breed, however you still need to take it slowly, put the female in her own "area" inside the males tank (such as a small jar/a mesh or plastic live-bearer birthing net,and if the male is truely interested in breeding, he will display and court the female by fanning his fins and gill plates, if the female is interested she will do the same, the male should also work tire-lessly on his bubble nest, deviding his time between courting te female nd working on his nest, once he stops building, then you can release te female.
he should lead her to the bottom on the nest and they should do their little fishy giddy giddy, and the BOOM.
the female needs to be taken out afterward or he WILL kill her