can be changed one week after the release of nitrifying bacteria. It usually takes 5-7 days to culture nitrifying bacteria. If the water is changed before the culture is successful, the new water will damage the original nitrification system, which will lead to a longer culture cycle. Therefore, it is necessary to wait until 7 days to ensure that the nitrification system has been established before changing the water. It should be noted that the sign of the establishment of nitrification system is that the water body changes from turbidity to clarity.
1. Clean the filter material: If the easiest way to destroy nitrifying bacteria is to clean the filter material, whether it is filter cotton or bacterial house, they are attached to a large number of nitrifying bacteria, so once cleaned, it will destroy the original nitrification system. The water in the fish tank will soon become turbid, so the filter material should not be washed frequently, and it is better to wash it in batches.
2. Frequent water change: In addition to cleaning the filter material, frequent water change will also affect the nitrifying bacteria, resulting in a large number of deaths. And if the water is changed too frequently, the fish will also be stimulated, resulting in some discomfort. Therefore, the water change cycle should be controlled in daily feeding, and it can be changed once a week.
3. Ultraviolet lamp: In order to ensure the safety of fish, regular sterilization is needed, and ultraviolet lamp is one of the means of sterilization. It should be noted that sterilization will not only kill harmful bacteria, but also destroy beneficial bacteria, so nitrifying bacteria will also die.
