Why is there only one strain of bacteria in the Mist? Isn't diversity good, too?

Yes, diversity is generally good! The cool thing about the AOB is that they are crucial to restoring "biome-balance." This means they help decrease the bad, to allow more good (of various kinds!) -- they act as a micro-mediator. We are, however, continually doing research and are hoping to work in collaboration with other strains in the future. Stay tuned!