When I was breeding them commercially I would setup a pair in a 10 gallon. Now that I am not doing it intentionally any longer, I still have a group of 4 in a 20H that are breeding like crazy.
Tetras (even neons) are pretty good fry predators. If you want to raise the babies you will want to move them to a separate tank.
Tetras (even neons) are pretty good fry predators. If you want to raise the babies you will want to move them to a separate tank.