I have lots of bettas. lol I have some of them in 2.5g heated tanks, but some of them are in 1g tanks. I just position them all on shelves and such so they can see other bettas so they have entertainment.
You can keep bettas in larger tanks with other fish, but make SURE you have a backup plan to pull them out if necessary. I have friends on another board who had her betta boy in w/gouramis and woke up one morning to find a murdered betta and a couple of very sheepish looking gouramis. I also myself rescued a poor betta boy that was in a tank at WalMart crouched in the corner - he was terrified of all the other fish he was in with. Oh, and then there was the little dalmation ct (or vt, not sure yet which he really is cuz his fins were all but gone) that was swimming obliviously around in the "plant tank" over at AniMart a few weeks back - he was in with some tetras, kilifish, guppies, mollies, etc. He had NO fins left. So he came home with me.
As it has been said, it does depend on the betta, but do keep in mind that bettas can and do snap, and a fish that seems perfectly comfortable living in with a bunch of other fish can one day turn ugly. But... many people have made it work.
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