The reasons and solutions for why the fish in the fish tank swim to the surface to breathe:

1. Change the water: It may be that the water quality is too poor and the fish swim to the surface to breathe. The owner can Improve water quality by doing water changes.

2. Oxygenation: It may be caused by the low oxygen content in the water. The owner can install a high-power oxygenation equipment.

3. Changing the tank: It may be caused by excessive stocking density. The owner can improve it by changing to a larger fish tank.

4. Reduce feeding: It may be that when the owner is feeding the fish, the goldfish eats too much food, causing the goldfish to float on the water and breathe. You can feed less in the future.

When raising fish, you must pay attention to:

1. Keep water: Before raising fish, you must first raise water. Ordinary tap water cannot be put into use directly. Disinfect and dechlorinate water. Disinfection can use related drugs or special salt. Dechlorination can be done by exposure to the sun or by standing still. It is also necessary to add nitrifying bacteria to the water to establish a nitrifying bacteria system to treat fish excrement in the water.

2. Feeding: Ensure adequate food when raising fish. Pay attention to the appropriate amount of feeding, and feed the amount that can be eaten within 5-10 minutes each time. The frequency of feeding should be determined based on the appropriate number of fish to be raised. Try not to feed at night or on cloudy days.

3. Change the water: When raising fish, you need to ensure that the water is clean and the water needs to be changed regularly. The frequency of water changes should be determined according to the habits of the species being raised. Generally, it needs to be changed every 7-10 days. Don’t let the water temperature and water quality change too much every time you change the water. In addition to ensuring the cleanliness of the water, changing the water can also ensure the oxygen content of the water, which is very necessary.

4. Do not mix fish: Some fish cannot be mixed. If they are mixed, they may fight or die. It is recommended to choose fish with similar habits and docile temperaments for mixed breeding.