It's a bit of a long story, but there's a betta I've fallen in love with at the pet store (he's a purple and white HM butterfly). The only way I can get him is if I divide my ten gallon and put two bettas in it. I've tried this before with mixed results (they were ceaselessly throwing themselves against the divider at one another).
I've just now divided the tank again and put the two boys in next to one another. It doesn't seem to be quite as violent as before, but they have spent the majority of the day flaring and "stalking" one another. This said, both are still eating and one even blew the beginnings of a bubblenest.
My biggest question is, is this a normal level of behavior, or are they stressed? I know that it will be selfish of me to get another betta unless I know that the two in the ten gallon can live next to one another and live a happy healthy existence. Thus, I am desperately resisting the temptation to get this butterfly betta until I know that my current boys are going to be content.