White clouds wouldn't be a very good choice because they are more of a coldwater fish. You would have to have the white clouds in the warmest safe temp. for them and your betta in coldest safe temp. for him. Although it could work neither fish would be very comfortable living in extreme temperatures for their species.
King PK Wasabi; HMPK Frostini; 5 CT Bettas Jewel, Shimmer, Opal, Scarlette (aka Ms. Piggy), Pixie; 1 SD Neptune; 1 HM Gypsy; 1 DTHM Pebbles; 4 Orange Von Rio Flame Tetras, 5 Bleeding Heart Tetras, 4 Harlequin Rasboras, 2 False Julii Corydoras Salt & Pepper, 1 Bristlenose Plecostomus Hoover, 2 Pictus Catfish, 1 Albino Rainbow Shark, 5 Dension Barbs