So far fry are doing OK and eating Daphnia. Kind of cool to watch, since they stalk the inverts, then lunge and swallow. The 10gal tank has a lid, so temp of air stays consistant. Good point about the Betta breeding though. Fins of all fry are now showing signs of nipping each other. I am planning on separating this weekend. I think I have a plan and will update you all. I found a floating livebearer breeding container that, with a little modification should work and take into account their gulping behavior.
Questions about the breeders. The breeder tank only contains the two Ornates. It is a 30gal, breeder. Water is filtered well water. I live in the Virginia lowlands, and the aquifer has a lot of iron. I have a home water softener and use the iron reducing salt. For water changes, I also run it through a single filter cartrige (to remove most other metal and impurities). The same water is used for all my tanks (to include a reef tank). No problems with water quality..so far.