I was sitting here watching Shu float around his tank when the thought crossed my mind, "Gee wouldn't it be great if you could have a tank full of these guys in all different colors without them fighting?" and then I remembered something from my dog training course that lead me to asking the question "Could betta's be bred for low agression?" An domestication experiment done in siberia with foxes for the fur trade proved that you could breed for tameness, and that there were color variations linked with tameness, eg. white spots, drooping ears and curled tails. So if people can breed bettas for color, why not breed them for tameness towards one another so that eventually you could breed them into community fish (as in all male communites) much like guppies? Considering how quick (in comparison to foxes or other animals) the breeding cycle is I'm sure you could do it given enough time and the proper tests. Some interesting things would be observed a few generations in I'd bet. Not sure what but since tameness in foxes resulted in dog like features and coat color changes, I'd bet reducing aggression in bettas would have similair results, though I'm not sure. Males guppies are just as flashy and they can live together? Any thoughts? It's not something I could try now, but if I ever won the lottery I'd be on this in a heart beat.