yes if they are too close
No. Betta fish will attack each other no matter the sex.
NO they will attack each other
All bettas will fight each other, male or female. Always keep them separated.
No, unless their lesbian.
Female beta fish are better in this way, they don't fight, allowing you to put them in a tank with each other as well other fish!
yes. the male may KILL the female
No, they can live alone or with other female bettas. They might bite each other but won't kill.
no because the male and femalebetas are the type of fish that live alone. therefor since their opposite sex then there is a chance of them being OK with each other, so if there is another fish with them then they will attack it and eventually killing each other.
NO female bettas do not fight each other
Yes, any fish smaller than it. Do not put it in a tank with tropical or saltwater fish because its not certain if it will attack, or even kill itself. Every betta fish is different, so I wouldn't take the chance. If you mix it with another male fish, they will attack each other to death. If you mix it with a female fish, they will mate.
Betta fish are very territorial, but during mating season they make a bubble nest to mate, when they male and female are the right ones to mate they will start to dance, after that they mate for about 30 minutes-8 hours. Finally when they are done the male will chase the female off and he will guard his nest until all the eggs have hatched.
During the mating season they will like each other. Otherwise the female will attack the male.