I have some experience with Zebra danio (zebrafish). They're a favorite fish of mine... active, hardy, not aggressive. The glofish are genetically modified (and thus illegal in some places like Europe); some google searching has suggested that the "glo" gene is autosomal dominant (thus, as long as the glofish breeds true- 2 copies of the glo gene- than all crosses of glofish x regular zebra should = glofish. Of course, the next generation would be a mix.) This is all speculation on my part, I've only ever had regular zebras.
I've had my zebras breed... but not on purpose.

They seem to breed in the early morning, about dawn, and are more likely to do so if you leave their light off for a day or two. More than once I've had a female drop eggs on a Monday morning after being out of town for the weekend. I've never done anything to protect the eggs, so they mostly get eaten, but a few slip through, and usually the fry then get eaten, but sometimes one or two will make it to adulthood. If you want more to live, I guess you should put them in a separate tank, with a large substrate to trap eggs. Remove the adults after they've laid- they'll eat eggs. I'd also say to put the breeding tank in a room in your home that you don't go in much (if possible) and leave the light off in both the room and the tank. If that's not possible, at least leave the tank light off.
Keep us posted!
P.S.: the fry eat infusoria.