They are called Siamise fighting fish of betta It is part if there nature that they fight. It depends on how large the tank is if they can live together or not. It also depend on the betta some can some can't. Females can live together if there are three or more. Males it depends there are calm bettas wich still attack but can live on a big tank with another male. Then there are aggressive bettas wich attack and probalbly should not be put together. If you put a male and a female together they might breed or the male might just chase the female around. If that happens take the female out and try again in a few more days buy unless you know what your doing it is advised that you don't try breeding bettas
hope that helps

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