I think mjoy maybe means black or white skirt tetras. A school of those would fit but they would be cramped. White clouds are a great addition because they don't need heaters. I agree with Izzy about the tiger barbs. Unless they are kept in big schools, they are little nip terrors. A better choice would be cherry barbs. They stay smaller and are far less aggressive.
Scarlet badis are beautiful, tiny fish and very difficult because they often require live foods. If you are lucky, they will take frozen bloodworm but most often they want live daphnia and that sort of thing.
Celestial pearl danios or harlequin rasboras would do nicely.