No they would kill each other in less than a minute
yes betta fish have to live alone or one will kill the other.
Any.
Yes it can
Some male betta fish are not as aggressive as others.
male
Yes. Betta Fish do change their coloer every now and then. Or if you have a male, he will change his coloer if hes chaseing a female Betta Fish. Or if he sees another male Betta Fish.
yes
She breeds with a male Betta Fish.
None are recommended if the Betta is a male.
Male Betta's are solitary. They cannot be placed with other fish. That's why they are known a Japanese fighting fish. They will kill other fish for territory.
No. Betta fish will attack each other no matter the sex.
Only female Bettas can be kept together. That too will only work if they are given reasonably roomy conditions and plenty of cover (plants) and hidey holes. Male betta fish can/ will fight to death if there is another male fish in the tank, a male will sometimes eat a female so your best bet is to have a single betta or a female and a female.