I think it is probably fun to build up such an elaborate system, trying to mimic a natural system in a specific river area. If the goal is just enjoyment, and that is certainly a worthwhile goal, then people who enjoy doing that should do so. But, growing a variety of plants in a tank of water that will also support fish very well, really doesn't require that complexity. We all need to understand our goals and do what fits those goals. That's why this is a hobby and not a profession.