The biggest problem of the negative pressure fish tank is that it is easy to lack oxygen, because the filtering equipment it uses is a filter cartridge, and it has less contact with the water surface, so it must use oxygenation equipment to give oxygen, otherwise the fish will easily lack oxygen. In addition, if the negative pressure is not properly adjusted, it may also increase the risk of fish tank bursting, or because the negative pressure is too high, leading to the death of fish in the tank.
1. Frequency of water change: The frequency of water change in the negative pressure fish tank is not fixed. It mainly depends on the maintenance of the water quality. If the water quality deteriorates quickly, it should be changed frequently. Otherwise, it can be changed again after a long time. Usually once a week is better, if the filter is better, it can also be changed once half a month.
2. Water change method: The negative pressure fish tank is divided into two areas, a negative pressure area and a normal pressure area. The water in the negative pressure area does not need to be changed. Only the water in the normal pressure area needs to be changed. Slowly pump out the water in the negative pressure area, but do not pump too much at a time, and the height of the water surface can not be lower than the lowest point of the negative pressure area. After pumping water, the new water is slowly added.
3. Precautions: No matter what kind of fish tank, the water should be changed slowly, not violently, otherwise it is easy for the fish to have a stress reaction, which is harmful to their health. In addition, we should ensure that the temperature of new water and old water is the same, and reduce the temperature difference between them as much as possible.
