Here is why an ecosystem tank typically won't work in application, though it sounds good in theory. There's a predator/prey/space ratio which helps keeps all the prey from being eaten by the predators in the wild,.. we just can't provide that amount of space or that amount of prey in a tank for even one predator.
Also, self contained systems are a bunch of hooey,.. like those glass balls with a plant, a shrimp, and a snail inside. HOOEY!!!
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