I don't think the tank would be big enough for white clouds personally. Rice fish definitely but not white clouds. Shrimp would be perfect. George farmer did a white cloud biotope, that with added moss would be amazing but not in a 5g.
Hmm, that's what I thought with the white clouds, will just have to wait until I get my 20 gallon in order then I guess. I'm intrigued by this rice fish you speak of, but I couldn't find anything on google about them (came up with a lot of recipes though) could you please tell me more?