Yup, she's a monster, but... Kandor needs an air pump? Because Rao knows we wouldn't want to do anything like, say, just stand the damn bottle in yellow sunlight which would make them instantly invulnerable and superstrong and never need to worry about air again. If they leave the gravity generator on then they don't need to worry about the flying.
Because that might make them question whether, even as micro-beings, they might not be able to be of some damn use to the planet which shelters them.