My betta is in a tank by himself, but from what I've read, any fish that has a flowing long tail might be a distraction and cause aggression in the betta. Fish like guppies and Swordtails...I'm sure there are others out there. Definitely keep them with non-aggressive, community fish.
ive kept my betta's with a variety of fish. I had kept one with gouramis, convicts and tiger barbs. i currently have a male and female with a male and female flagfish, 2 pencilfish and 2 guppies.
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