Yes, most people keep bettas in bowls. This is supposedly acceptable because "they live in footprints left by oxen in the wild," or because "bettas have special organs that let them breathe air. However, in the wild, there is water moving through these almost constantly. This doesn't happen in bowls. Most people probably don't change the water at all. Bettas can in fact breathe air from the surface of the water, but they are fish, and need clean water. You could live in a closet for your whole life, but would you like to? I've never personally kept one because all of the pet stores around here keep them in little cups, and half of them are dead, and the other half look like they could die at any time, so I've never bought one. From what I've read on here, bettas kept in larger (and more humane) aquariums have a lot of personality and move around a lot. You can get a ten gallon tank with a filter, heater, hood, and light at WalMart for like 35 dollars. Spend maybe ten more on some gravel and a couple of fake silk plants, and your betta would be much happier and you wouldn't have to worry (as much) about it getting ill and dying. As far as them living in a community tank, they will. I don't think tiger barbs are the best tankmates though, as they can be nippy. Due to the long fins, nippy tank mates aren't the best. A ten gallon tank with a betta, five white clouds, and three cories would probably work very well.