I was alway told that you cannot put 2 betas together (regardless of sex).
My daughter had a beta (named Sushii) and we stood a mirror on the outside of the fish bowl. Sushi would then puff and flare up at the other beta (her reflection) which was so pretty and no harm done.
I found this link which may be helpful.
Good luck t.pettet
A dog wags his tail with his heart
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