They can be housed with livebearers, though they'll eat the fry. Tetras, loaches, otos, most tropcal fish except gourami. You do come across aggressive fish, but that will happen in any tropical tank. I have had my male (who is aggressive with females) with a platy for a while and both stay out of each other's way respectfully. Fancy bettas sold in stores were not made to fight. They were made to have beautiful flowing fins. They also don't have the hard "teeth" scales and muscles of a conditioned fighter. Fighting fish don't fight to the death either, they flare and chase and bite fins until one gives up, but the don't often die and aren't often badly injured. I find my females can be much more aggressive.
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