in the goldfish tank needs great attention. First of all, the new water must be dried for two or three days before use, so that the chlorine in the water dissipates and impurities precipitate, so that the upper water is taken when changing the water, which is more suitable for the growth of goldfish. Secondly, when changing water, the water temperature of the new water and the water temperature of the old water in the fish tank must be consistent, not too different, otherwise it is easy to make the goldfish sick. Moreover, when changing water, can not change too much at a time, otherwise it will make goldfish feel strange to the living environment, which is not conducive to the growth of goldfish, generally only one third of the water can be changed at a time.
? The most suitable water for the growth of goldfish is the old water that people often say. This kind of water is rich in nitrifying bacteria, which can decompose harmful substances to goldfish in the water and form a good ecological environment. If the water is changed frequently, it will destroy the ecology. So if the fish tank is equipped with a perfect filtration and oxygen supply system, it is not necessary to change the water frequently, just add a little water regularly because of the reduction of evaporation. If it is a relatively small fish tank, there is no filtration and oxygen supply equipment, then the water quality can only be improved by regular water changes. In this case, water is usually changed once every 5-7 days in summer, once every 10 days in spring and autumn, and once every half month in winter.
