Since a male betta's territory could be miles long and the domesticated bettas are so aggressive to each other, it really can't be recreated in a tank with good success. There have been many try it but there is always one male that will harass the other no matter how big the tank. In the wild, the males are able to fully get away from each other which means that they rarely ever fight and cause damage but in a tank situation there is no real way for them to escape the other male. Even the wild splendens are more aggressive than the other wild betta species and are not recommended to be kept in the same tank together unless it is a larger tank with plenty of plants and hiding places.