After weeks of cycling, I have finally added the female bettas. The tank is planted with hygrophila corymbosa, java ferns, anubias var. nana, and vallisneria spiralis. The aquarium is heated and filtered with an Aquaclear 20.
Glimmer is a beautiful Cambodian female who is my favorite. She and Apple tend to follow each other like friends, but flare at each other every once in a while too. Her name comes from how her tail glimmers when she moves around.
Apple seems to be the alpha female so far (it's only been less than a day), she is quick, and tends to chase down other bettas.
Smokey tends to swim at the bottom. When first introduced to the tank, she and Midnight fought each other to become alpha but somehow Apple ended up being alpha. Their fight must've been pretty tiring, thus she has stress stripes.
Spot is pretty tolerant of everyone around her. She appears pregnant, but bettas can't get pregnant. So I guess she is just a bit wide. She has spots on her tail, thus her namesake.
Finally, there is Midnight. She stays near the bottom of the fish tank like Smokey, and she is often the target of Apple's chases, thus her stress stripes.