Yes they can, as long as its not another beta there shouldn't be any other problems
Not likely. Most species (of everything, not just fish), unless closely related 'subspecies' can not be bred together naturally.
Yes.
Yes, Betta Fish are extremely aggressive and they will most likely kill your other fish.
other Betta fish and the bigger fish.
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.
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.
becuse thay bite other fish
No. Betta fish will attack each other no matter the sex.
Take the Betta out as soon as possible.I have a Betta in my tank with other fish,but he doesnt fight with my fish at all.
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.
Well, if you love your Betta fish, then it should live by itself. But if you add another Betta to your current Betta fish's tank, then they will start a fight because Betta Fish are Siamese fighting fish and if one Betta is in contact of another Betta, the possible reason would be a fight between them two.
No, Betta fish are aggressive toward any other fish they see. They cannot mate.
It is quite possible that the Convict cichlid would kill a fish as small and slow as a Betta. I would not try to mix other peaceful species with large aggressive fish like Convicts.
Male Betta splendens fight with other male Betta splendens so the answer is most other fish will not fight with a Betta in the same tank. To try to list every species of fish here would be impossible.