Look at experiments on this theme, like the Biosphere
Biosphere - Wikipedia...
They tried to simplify a whole-cycle system with just a "few" bugs. It turned out to be MUCH more complicated than we thought...
Space/Science » in reply to 100 species?
Biosphere - Wikipedia...
They tried to simplify a whole-cycle system with just a "few" bugs. It turned out to be MUCH more complicated than we thought...