I have 3 female bettas in a community tank too.
Currently, there is a moonlight gourami, 4 panda cories, 3 guppy fry about 2 and 1/2 months, a bristlenose cat, and a bumblebee goby. I did have a male betta who spawned with one of the girls in the same tank, but I removed him as he was getting too tired trying to defend his nest against all the other fish who were hungry for cavier. I thought that part was unfair on him so I removed him. I know alot of people on this forum thinks I was wrong to let him in there at all, no harm was done to any of my fish and he did a favour to my girl who seemed unable to drop her eggs on her own.
I still have a girl Betta who is bigger than the other girl who isn't getting rid of her eggs yet, and I am very worried about the poor thing. She is going into a tank for breeding to hopefully get things going for her in the wuvmybetta pinned topic like environment, heaters, filters, plants and all with my vt male (not the one in the community).
She'll be heading back into the community tank if she lives (prayers) to drop or give her eggs away.
The fish I have are all peaceful tank mates. I did have tetras but for some reason they died on me recently... my tank had perfect perameters so I am not sure why. Might have been the melafake I added to the water for the girls benefit. When first put in there they nipped each others fins alot. When my male betta got in there they relaxed with each other and were busy either courting him or avoiding his attentions. He didn't endure any nipping by the way. This is an unusual situation and not recommended unless you got alot of time on your hands and a betta boy who is very peaceful. They do exist but you might not find out for some weeks/months - we've had Mr Personality for at least 4 and a half months, so we had him sussed.
So yes, girls can inhabit a community aquarium but be prepared for in house fighting until they sought out their pecking order. Also, you can never be entirely sure about temperment, some fish might be OK some not. Its all about trial and error I'm afraid.
Good luck in your new tank.
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