I wouldn't do betta's in a 5 gallon.
Why not? I've successfully bred 100s of Bettas in shoeboxes and sweater trays that yielded thousands of fish over the years. You can see some of my breeding tanks in my albums. The depth of the water is more important than the volume of water when it comes to breeding Bettas.I wouldn't do betta's in a 5 gallon.