What is the smallest tank you can breed a betta fish in?

Bettas are beautiful and popular fish that are often kept in small tanks, but it's important to remember that they need enough room to swim and explore. The minimum tank size for a betta fish is 5 gallons, although a 10-gallon tank is ideal. This will give your betta plenty of space to move around and explore, as well as provide enough room for plants and decorations.