no fish around
they shed every 2 weeks
I guess you are referring to the Bettas "Labyrinth" this is a chamber in the skull of the fish that allows it to 'breath' air. This adaptation is what enables the fish to survive in adverse (low Oxygen) water conditions in the wild. When you see a Betta rise to the surface of the water and take a gulp of air he is using his 'labyrinth'.
Some male betta fish are not as aggressive as others.
Hundreds is typical although some will die young.
Some are Betta's and Goldfish
Yes.
No Way. Betta's were imported to Europe in the 1890s. It is extremely popular, a must have fish for every aquarist at some stage.
some fish lick there butts
No betta fish are carnivores.
other Betta fish and the bigger fish.
Betta fish do not eat fish.
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.