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A betta fish is anywhere from 1 to 2 inches.
Betta fish can be from 2 to 4 inches long when fully grown.
Betta fish grow to be an average of 2 inches from head to the beginning of the tail.
a long time
Depends what fish you have, if the fish are colourful and have long fins then it'll probably bite it to death, every betta is different.
Some are, most are not.
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.
Bettas are dumb as rocks. If you put another betta, any other anabantid like a gourami, or any long-finned fish in with a betta, the betta will fight it because he will think it's another betta. If you put a short-finned fish in with your betta, they'll live together peacefully.
No betta fish are carnivores.
other Betta fish and the bigger fish.
Betta fish do not eat fish.
You don't. Those fish are bred and born to fight each other. Keep them in seperate tanks. Sorry :(