Because the female will usually try to eat the eggs. He will fight to protect them from anything, even his mate.
Only if they are both in breeding condition. If they are not he will kill her. If they do breed (Spawn) she must be removed immediately afterwards otherwise he will kill her.
Only male Bettas fight and they will only fight with other male Bettas. A male Betta will kill the female if she will not spawn with him. He will also kill her after she has spawned if she is not removed.
Only male Bettas fight and they will only fight with other male Bettas. A male Betta will kill the female if she will not spawn with him. He will also kill her after she has spawned if she is not removed.
The problem will not be the tetras coexisting with the Bettas. It will be the female Betta. She will undoubtedly be killed by the male. He may well spawn her first but afterwards, if she is left in his presence he will kill her. Also if he has ova or fry to look after he will kill the tetras in defence of his young.
The male will kill the female after he spawns her. If she won't spawn he will still kill her. No male Betta will allow another Betta (male or female) to live in its vicinity. So the answer is NO.
When a female Betta is introduced to a male Betta one of two things will happen. The male will build a bubble nest and try to spawn the female and during the courting time he will drive off any other occupants of the tank and kill them if they can not escape (hide successfully). He does this in order to protect his prospective young. If she fails to spawn he will drive her off and kill her if she is not removed. In other words you can not keep a male Betta with another Betta (male or female) without trouble. The Tetras will be perfectly OK with a Betta female OR a Betta male. Not the two (pair) that you are proposing. The general rule that all experienced and successfull aquarists live by is a fish needs 1 gallon of water per inch of body length. Work it out.
Np, but they will bite. Yes, they will fight to the death.
yes betta fish have to live alone or one will kill the other.
Any other Betta can kill a female. Bettas are so agressive that they will even kill their babies if they wanter to. Also, larger predators can kill.
Not always, but it's very likely. Some females kill males ;)
You don't know. And her likes or dislikes will only apply to the nest he builds and his courting ability (flashing display).The male will either spawn her or kill her. It is your job to make sure she is in condition to spawn and full of ova (eggs). Then provided you keep an eye on things everything should go as planned.
Yes they will. Male Bettas will fight if they are in the same aquarium with another male Betta. Other than by separating them, there is nothing that can be done to stop them fighting. They have evolved over millions of years to do this. A Male Betta is OK with all other species of fish but he will fight another male Betta on sight. He will attack and kill a female Betta too if she doesn't spawn with him. Even if she does spawn with him, she will be killed as soon as spawning is over if she is not removed from his tank. Several female Bettas can be kept together OK. It is only the males that behave that way.