White clouds will get eaten as the comets grow and become faster.
Dojo loach only if the tank is at least three foot long as they can grow to a foot in length and are very active fish so a tight fitting lid is essential.
Cory cats stay small and can be hoovered up by large goldfish and the spines of the cory will lodge in the throat.
Bristlenose plecs can only go in if the water is heated to around 18-20c.
So really only other comets or single tailed fish, unless you can get rosey red minnows which grow a lot bigger than the white clouds.