Nope, you need a much bigger tank for what you have. The clown loaches need to be in groups of three or more and will get 12 inches each. The pictus need even a bigger tank then the clowns. Neons are also schooling and need to be in a bigger group. I'm assuming the zebras are danios? They're schooling and need to be in a group of 6 as well.
Bettas also do better solitary then they do in a community tank. They are often picked on by other fish who are attracted to their fins, they have a hard time with the filters, and they often get stressed with the large area to patrol. If you want a betta I'd get him his own tank, but I believe your current one needs replacing first.