5 gallon tank= a good betta tank with live plants. Your betta will display beautiful swimming, flaring and exploring behavior in these larger tanks that you may not see when they are kept in smaller habitats.
Some beginner tips for betta care. I'm still shocked at how many people don't realize bettas are tropical fish who need heaters. I still think they should add in the part about bettas needing 3 gallon or larger tanks,