Can you spin the biowheel freely, using your finger? If you try to spin it and it sticks at all, you may have it inserted improperly. Is your water flowing up and through the media cartridge?
I have a similar tank, and everything works great.
If you are going to add more fish, you should cycle the tank first. After it's done cycling, depending on your betta's personality, you *may* be able to add a couple of Oto Catfish (definitely do not add these until your cycle is complete, because they are very sensitive to water quality.) Or a small school (maybe 4?) of rasboras or white clouds. If your betta is particularly aggressive, the aforementioned options may not work.
Bettas don't tend to like brightly colored tankmates. (They think it is another betta, and want to attack it.) So you are best to stick to tankmates with less color. African Dwarf frogs make good tankmates. Some bettas can be kept with nicely colored shrimp, like Cherry Fire shrimp. However, some bettas will eat them. Ghost shrimp are another possibility.
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