How to raise fish in large tanks in rural areas

It is feasible to raise fish in large tanks in rural areas, but the tanks should be large and shaded. It is best to raise loaches and wild goldfish with strong vitality. The smaller the water tank, the more difficult it is to control the change of water quality, and the aquatic organisms with unstable water quality will not survive easily. On the contrary, the bigger the water tank, the smaller the change of water quality in a short time.