I don't think you can mate bettas because when they are placed with other bettas, they fight and kill eachother. On the other hand, you can actually put a betta fish in a tank with other fish besides another betta. There shouldn't be 2 bettas in 1 fish tank together. The betta should only be with fish that aren't aggressive. Try and pick calm fish like guppies and garami's. We currently have a betta in a huge fish tank with all our other fish and it does great. We have guppies, garamis, ram fish, knife fish, small fish like that. None are agressive and they all seem to get along with eachother fine.
Hope that helps! =]
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