buy a clouded or colored devider then the two males wont flare, i personaly would go with 2 males, possabily two different tail types, females either need to be kept alone or in large groups in tanks that are big enought to provide plenty of hiding places and lots of swimming room.shrimp and frogs wouldnt add too much waste to the tank aslong as your filtering correctly, shrimps might be eaten so try one or two at first, i think 1 bette along with a few shrimp on one side and another betta and 2 ADF's on the other side.research about ADF's first as you can learn some ace tips about them on different forums and websites. i think common glass shrimp will be best, but other shrimp i would have thought would survive too, amano shrimps would work.OR you could just chose one really nice looking betta and give him whole tank maybe with a few tank mate like shrimp,frogs or even a few bottom dwellers such as pygmy corys or ottos, not sure?make sure you heat the tank too and keep up with water changes etc and it would be fine IMO