Corydora breeding help?

so my corydora trio have been spawning like crazy since the snow melted, and when they do i set up a small betta tank it holds like a quart of water or so not sure, but i set up a bubbler and put in 10 drops of peroxide(pet store says it works just as well as methylene blue) and for 5 days add another drop per day, so at the 5 day mark, no eggs hatched, all still a white color, are my corydoras infertile or something? what am i doing wrong, what can i do to get them hatched?