When they are young they are OK but as the young males start to develop they will start to fight. I found the best way to avoid damaged fins from fighting is to keep a very close watch and as soon as you think a fishes fins are getting a bit bigger than the others around it, assume it is a male and put it in its own tank. If you are wrong it doesn't matter, because it can be put back it it's a female but if you are right you have stopped the fish having damaged fins which lowers its value.
Betta fish of the opposite sex will not always kill each other. It is actually an uncommon occurrence.
No. Betta fish will attack each other no matter the sex.
It is courtship but be careful during the mating the male will kill the female then the male will make a bubble nest. When the babies hatch be shure to separate the babies or they will eat each other hope this helps
Most fish get along well. However, do NOT mix betta fish with other fish. Not even another betta. You have to have a permit to have to betta fish in the same tank with eachother. Betta fish are only mixed to mate. Bettas are not born in the egg. They come out as a very small fish. After the betta babies have come out, all of the fish are seperated. Even the parents, if the betta babies are left in the tank with the others the betta parents are very likely to eat the others.
I have never seen any Betta fish's go crazy, but, it is possible.
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.
yes
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 can live alone or with other female bettas. They might bite each other but won't kill.
other Betta fish and the bigger fish.
NO they will attack each other
No, unless their lesbian.