To keep your goldfish alive for a long time, you need to pay attention to the following aspects:
Water Quality Management:

- Keep the water clean and change the water regularly. When changing the water, the amount of water changed each time should not exceed one - third to avoid drastic changes in the aquarium environment. Adjust the water - changing frequency according to the season and stocking density. For example, in summer, you can change the water every 3 - 4 days; in spring and autumn, about every 10 days; and in winter, every half a month. If the stocking density is high, change the water more frequently.
- Use clean, non - toxic, and pollution - free water sources. Natural water sources such as river water and pond water can be directly added to the aquarium. However, groundwater like well water and spring water has a large temperature difference and should be exposed to sunlight to adjust the temperature. Tap water should be dechlorinated. It can be left outdoors for 2 - 3 days or dechlorinated with sodium thiosulfate.
- Use a filtration system to remove impurities and harmful substances in the water and keep the water clean.
Feed Selection and Feeding:
- Choose a variety of feeds to ensure a balanced diet for goldfish, such as fish food, bloodworms, earthworms, and aquatic plants.
- Control the feeding amount. It is recommended to feed 1 - 2 times a day, and the amount of feed each time should be controlled so that the goldfish can finish it within 5 minutes. Over - feeding can easily lead to water pollution and affect the health of goldfish. Adopt the method of "feeding small amounts but frequently".
Water Temperature and Environment Control:
- Goldfish are suitable for living in water with a relatively low temperature. The water temperature is generally controlled between 18 - 28°C, and it is best to be controlled between 20 - 22°C. When changing the water, the temperature difference between the new water and the old water should not exceed 3°C.
- Keep the water temperature stable. Pay attention to cooling in summer and prevent freezing and keep warm in winter.
- Place the aquarium in a well - ventilated and well - lit place for easy viewing and daily management. The size of the aquarium should be appropriate and not too small. It is recommended that the minimum size of the aquarium for one goldfish is 40 liters, and for each additional goldfish, an additional 10 liters of tank size should be added.
Disease Prevention and Treatment:
- Observe the activity status and body surface of goldfish regularly. Take timely measures if any abnormalities are found.
- Regularly disinfect the aquarium and goldfish with 2 - 3% salt water to prevent the occurrence of diseases.
Other Precautions:
- Ensure sufficient oxygen. You can put an air pump to add oxygen or increase the oxygen content in the water through water circulation.
- Goldfish are timid and easily frightened. Try to avoid scaring them during water changes or daily management.
- Clean the feces and leftover bait in the aquarium in a timely manner to keep the water clean.
By following these breeding methods, you can provide a healthy and comfortable growth environment for your goldfish, thus prolonging its lifespan.