i have 9 female bettas in a community tank (guppies, neons, cardinal, chain loaches, pleco khuli loaches) 5 youngsters approx6 months, others about 9-10 months. at first i had a single female in the tank and she kept 'eating' my guppies tails. as soon as i added more females the guppies have kept their tails.
they are brilliant fish and work well in my community tank. they do tend to pig out at food time. i have plenty of places for them to hide or get away from each other, but all in all hey are good with each other.
it is fun to watch them size up with each other but it has never
LED to any fights. they all have great unique personalities.