Can you put a female and male Betta fish in the same tank or bowl will they fight to death?

While it is possible to keep a male and female Betta fish in the same tank, it is not recommended as they are highly territorial and aggressive toward each other. There is a significant risk of serious injury or even death in a fight between male and female Bettas due to:

Fighting: Bettas are naturally territorial and will defend their territory against any perceived threat, including another Betta. When a male and female Betta are placed together, they may engage in fights, chasing, nipping, and flaring their fins in an attempt to intimidate each other.

Stress: Constant conflict and high level of stress from living in shared territory can compromise their immune systems, making them more susceptible to diseases and potentially shorten their lifespan.

To ensure the well-being and safety of your Bettas, it is generally best to keep male and female Bettas in separate tanks or provide a well divided tank with physical barriers that fully section off their area to prevent a direct sight lines and encounters