The water in the small fish tank is usually changed once every three to four days. Fish tank is relatively small, the decay rate of water quality is relatively fast, if the water is not changed for a long time, the ammonia nitrogen content in the water body is too high, which is also harmful to fish. Moreover, changing water can also improve the oxygen content in the water body, so as to avoid the death of fish due to hypoxia. However, although changing water has many advantages, it can not be changed every day, otherwise it will stimulate the fish body.
1. Pay attention to water temperature: The first thing to pay attention to when changing water is the water temperature. The change of water temperature is the easiest to stimulate the fish. Usually, before preparing to change water, it is necessary to check the water temperature in the original cylinder, and the difference between the temperature of the new water to be changed and its temperature should be controlled within 1-2 C, so that the water will not cause too much change after changing.
2. Pay attention to the water quality: When changing the water, you should also pay attention to the stability of the water quality. If the original water is weakly acidic and the new water is alkaline, it will cause changes in hardness. Or the original tank is soft water, the hardness of new water is too large, will also affect the health of fish. Usually, as long as the source of new water and old water is the same, the difference in water quality will not be too big, do not use water from other places.
3. Pay attention to the amount of water: You should also pay attention to the amount of water you change. Changing too little water will not have any effect. Changing too much water will also stimulate the fish. Generally, the amount of water for changing is about a quarter of the total amount of water. When changing the water, it is necessary to pump the water from the bottom, and then slowly pour the new water from the wall of the tank.
