Yes, if you separate them for 1 week in a tank with a clear divider.
No. Betta fish will attack each other no matter the sex.
cause they are hungry.
Betta fish of the opposite sex will not always kill each other. It is actually an uncommon occurrence.
I have never seen any Betta fish's go crazy, but, it is possible.
yes
The Betta fish runs away when facing another Betta because its the first time facing another one. Or its just scared of it and doesn't want to fight since its not use to it and its a FIGHTING fish. But once its use to it the other Betta they well start getting up close to each other face to face and start ripping out each others fins out and basically trying to kill each other chasing each other around.
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!
NO they will attack each other
No, unless their lesbian.
No, they can live alone or with other female bettas. They might bite each other but won't kill.
other Betta fish and the bigger fish.
put them in a separate tank