Tonight I bought 4 female bettas to go with my other two in my 55 gallon community tank. I put them all in there about 45 minutes ago and so far everything is going well. They're facing off with each other and displaying dominance, but there hasn't been any real chasing or nipping.
My dwarf gourami is HILARIOUS though! When I first put the girls in, my gourami swam over to the red one and started following her and reaching out her ventral/whisker things and touching her! hahaha OMG it was ridiculously cute!