Can't turn off the circulating pump at night when raising koi fish. No matter what kind of fish are raised, the circulating pump should be turned on at all times. Once it is turned off, it will accelerate the deterioration of water quality, which is harmful to the health of fish. In addition, closing the circulating pump will also affect the growth and reproduction of nitrifying bacteria, which will lead to the collapse of ecological cycle. Usually, the power consumption of circulating pump is not high, so it is not a big problem to drive at all times. In addition, it is necessary to ensure that its flow rate is sufficient to maintain the water quality.

1, help filter: The main function of circulating pump is to help filter. It can make the water in the fish tank flow, on the one hand, it can make impurities gather, on the other hand, it can play a filtering role when passing through filter materials. If the water can't flow, the filtration effect will be greatly reduced or even completely ineffective.

2. Promoting activities: Fish live in water, and the flow of water can also promote it to swim. Only when it swims all the time will it not be washed away by the current. It is precisely because fish swim that its metabolism will be accelerated, and at the same time it can promote digestion, which is very helpful to its health and even reduces the possibility of getting sick.

3. Maintaining water quality: Water circulation is also helpful to maintain water quality. As the saying goes, running water does not rot, and the growth and reproduction of microorganisms will be limited to some extent. Moreover, flowing water is also helpful to nitrifying bacteria. If water is still, nitrification system is easy to collapse.