WHOA! No cycle?
I know you were excited and all, but you always need to cycle. Fish-in cycles are not only need more water changes, but stress the fish out way more.
Good that you seeded the tank with rocks, but you will have a spike anyway.
LOVE sororities! I have one in my 55 right now. Only 6 though, and a couple of platies. So not really a sorority. But I still have Betta's together, so it counts IMO.
When the Platies bite the dust, I might add more females. I know that will start a new pecking order and agression, but I think my tank is planted enough. The swords will grow in until that happens.
Anyway, your Betta's sound stunning! My females are cute. All from petsmart. Got them when they were only kittens :3
Do not know how to post a pic, but here is a Flickr link if it will work. Only 3 in this pic.
Or copy and paste this
EDIT: They are full of eggs, that is why they are so fat :P