I don't have any experience in females in a community by themselves, and really wouldn't try it(knowing the temperament of my girls).I would suggest having a female betta only tank. I have a 10 gallon community with 6 females, and everyone gets on fine. I have definitely had problems and one had to be permanently taken out of the tank, but now everything is fine. Make sure it is heavily planted, put them in one by one, and keep a good eye on them for a while. There will be some minor fights, but they should work out the pecking order before too long.