I thought so too, but at a wedding a couple weeks ago they had a long, tall vase at the head table with 5 females. I always thought they were all white, but there were some blues and reds. They don't have the long beautiful tails that the mails do tho. I think it's all in the food?
If you want to see what one male will do if it sees another male, just hold a mirror up to the bowl and watch what the fish will do. It will try to attack it's reflection.
Likely one of the males will be killed. Sometimes even the females are agressive enough to not be able to live in a community. Females can be very colorful, but their fins are shorter. There should be at least 4 females in a sorority, anything less and there could be aggression problems. Food can help with color but mostly it is the care they receive and the conditions they are kept in.
On a side note, a single Betta should be in at least a 2.5 gallon (preferably a 5 gallon or larger) cycled, filtered, heated tank with frequent water changes. The temperature should be kept at about 78F. I know you didn't ask about that, but that is my PSA for the day.
But you can put a male beta in a tank with other community fish and they will live in harmony. I have had many betas in my tank with all my other fish... just no other betas. Also, sometimes if you put a male and female in a tank they will fight. It just depends on the fish.
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