I still think females should be housed individually or with shrimp or a snail. I tried to have a sorority, I planted the tank, even added silk plants too. A bunch of caves and things to give each fish a place to hide. They were fine for a couple months but then I started noticing nipped fins, sometimes we think fish get along because we don't see it happen but it happens a lot when the lights are off. I used to support correct sorority setups but I changed my opinion after having to buy 5 separate tanks and cycle all 5 and buy them plants and heaters etc, it was a costly mistake on my end. But the ladies are happy and healthy in their own tanks now. My mom has a betta in with tetra, it's also nipped. She believed that the similar conditions would mean they can get along. Females are though still aggressive towards other bettas except for mating usually, and if it isn't the betta being a bully they can end up being bullied or out competed for food. It's just coded into their DNA to be mostly solitary fish but very controversial