Whether the filter in an aquarium is necessary?

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In an ecosystem of any aquarium fight of two dialectic contrasts is observed: on the different parties of barricades fishes and plants settle down. The advantage for one turns in inevitable harm for other inhabitants. The organic chemistry which is forming in an aquarium as a result of activity of fishes, is useful to plants, but is pernicious for other inhabitants of an aquarium. But not everything is so unambiguous. Let's tell, water with a certain structure is favorable both flora, and fauna. But, unlike plants, fishes are affected catastrophically by nitrites and ammonia...

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