If female bettas are kept in the same tank as a male betta, the chances are that over time the male betta may get it into his head to breed. He will begin to make a bubblenest and will become extremely aggressive toward any fish that comes anywhere near the bubblenest. Even a 20 or 30 gallon tank will suddenly become much too small for your male betta’s aggression – all his tank mates will be cowering behind plants at the other side of the tank if they want to keep their fins.
Many betta keepers do have both male and female betta fish together in larger community tanks; just be aware that if your male decides to breed, you’ll need to move him to his own space.
More than one female betta can be kept in a community tank. You can have as many female bettas together as you want, so long as you’re not overcrowding. The female bettas may squabble and may occasionally tear one another’s fans but their aggression will be significantly less than their male counterparts, and it’s highly unlikely any of them will ever suffer serious damage.
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