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An important source of energy coming into the tank is the lighting. First time at becoming an aquarium (where the plant is not grown) power of the lamps should be small, because of the energy of light, not absorbed by higher plants, contributes to the development of algae. As the growth of plants can increase the number of lamps. We assume that all is well in the aquarium: algae did not appear, the lighting is chosen correctly, the plants have taken root and is actively developing, the fish have adapted to new conditions. This state means moving into the second stage of the ecosystem. Clear time boundary between the first and second stages may not be possible. In the popular literature of the second stage of the steady state of the aquarium is often characterized by "biological equilibrium".

However, this term is unfortunate. Despite the fact that the tank during this period is quite stable, the energy balance (balance of incoming and outgoing energy) is not: always there is an accumulation of some substances and the use of others. More successful, as we seems to be the term "steady state aquarium." Wiki Actions in this period of ecosystem development can be reduced to prophylactic measures: thinning of overgrown plants, removing dead leaves, periodic cleaning of the bottom, water changes, keeping the light and temperature re regimes, during this period the aquarium has the ability and self-regulation. For example, the substitution of up to one third of the water is almost quietly and without negative consequences.