The owner of an aquarium 19 liters using the method Walstad, known from microbiologist Diana Walstad, to create an ecosystem without filters, no CO2 and fertilizer, that the aquarium is fully autonomous and more natural.

A layer of soil covered with a gravel layer, It allows plants to grow quickly and correctly, to replace the algae and recycle fish waste. The plants also remove toxins such as ammonia and nitrite, a job that could not do without proper roots and soil.

The plants and fish to balance each other's needs and ecosystem functions harmoniously.