I would do 6 or 7 neons rather then 5 because they feel safer in schools and you have the room for it. They should be fine with your female bettas.
You can do a lot of cool fish with a sorority, here's a video of mine that shows a large variety http://www.youtube.com/watch?v=6cSFS95i6ss&list=UU5QPzcyW6sHN0OBkffHzk7A&index=2&feature=plcp
You can do a lot of cool fish with a sorority, here's a video of mine that shows a large variety http://www.youtube.com/watch?v=6cSFS95i6ss&list=UU5QPzcyW6sHN0OBkffHzk7A&index=2&feature=plcp
