Tap water is the best for fish culture in fish tank. This kind of water itself has been disinfected by waterworks, and it is not polluted, so it can be used with confidence. However, it should be noted that there may be residual chlorine in the disinfection process, which is harmful to the health of fish. Therefore, just received tap water should not be poured into the fish tank immediately. It is best to dry it for a few days and wait until chlorine volatilizes before using it for fish farming.

1. Water temperature: Pay attention to the water temperature first in fish farming. Too low temperature will lead to the loss of appetite of fish. For some tropical fish, low temperature will even make them die. Usually, the water temperature should be controlled above 20 ℃, so that the fish will be more lively. You can use a heating rod to heat up, but you must not rise too fast.

2. Water quality: If the water quality is not good, the health of fish will also be affected. In order to maintain the water quality, it is necessary to change the water regularly. If the water is not changed for a long time, the harmful substances in the water will increase, which will lead to fish poisoning. Usually, the water change period is one week, and if there is filtration equipment, it can be changed once every half month.

3. Dissolved oxygen: The level of dissolved oxygen in water will affect the breathing of fish. If the oxygen is low, fish will float, and a large number of fish will die if they are not oxygenated in time. In view of this situation, you can use an oxygen pump to pump oxygen into the water, and the time of oxygen pumping is about 2-4 hours every day.