The time for changing the water in the fish tank should be determined according to the situation. Under normal circumstances, the water in the fish tank should be changed once a week. If it is during the change of seasons or the water quality is relatively poor, the water should generally be changed every three or four days, and the amount of water changed should be increased.

Points to note when changing the water in the fish tank

1. Amount of water change: When changing the water every time, you do not need to change all the water every time, only change 1/ 5 to 1/3 of the water is enough. In this way, the fish will adapt to the new water quality faster and there will be no discomfort.

2. Change the water temperature: Pay attention to the water temperature when changing the water. The temperature difference between the new water and the old water should not exceed ±3℃, otherwise the fish will become uncomfortable and the chance of getting sick will be more than 30%.

3. PH value: Great changes in PH value also cause great harm to fish. Before raising a certain kind of fish, you must know the water temperature, PH value, water hardness, etc. in which the fish lives. First adjust the water to If the environment is suitable for fish to live in, it will be better to change the water.