If he's not chasing the other fish all over the tank, just staking out his little corner, I think it's fine. The other fish won't get too stressed as long as he's not hunting them down. My Betta likes to do that, too. I do think it enriches their lives, and keeps them from getting bored. I know that the Bettas I've had in larger community tanks have lived longer than the Bettas I kept in smaller tanks by themselves. For whatever that's worth.
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