When changing water for goldfish, there is no need to add salt. Goldfish are freshwater fish, and water with salt added is somewhat irritating to them and is not conducive to their living environment. Also, adding salt is not beneficial for nitrifying bacteria in the water to decompose harmful substances.
Pros and Cons of Adding Salt When Changing Water for Goldfish
Advantages
- Sterilization: Adding salt can kill bacteria and parasites by adjusting the osmotic pressure. It also helps ornamental fish regulate their internal osmotic pressure, reducing the burden on their kidneys and livers.
- Adjuvant Therapy: When goldfish are sick, adding an appropriate amount of salt can be used as an adjuvant treatment method to help with sterilization and promote recovery.
Disadvantages
- Irritation: Water with salt added is somewhat irritating to goldfish, which is not good for their health.
- Impact on Nitrifying Bacteria: Adding salt will inhibit the activity of nitrifying bacteria, making it difficult for them to decompose harmful substances in the water.
The Correct Way to Change Water for Goldfish
- Frequency: It is generally recommended to change the water every three to six days, replacing one - third of the water volume each time. Do not use tap water directly because tap water contains chlorine and other substances harmful to fish. It needs to be left standing for three days before use.
- Precautions: When changing water, pay attention to keep the water temperature difference from being too large to avoid irritating the goldfish. At the same time, ensure the quality of the new water to avoid introducing harmful substances.