Koi is a large ornamental fish, which requires high oxygen and space. If you want to raise koi for a long time, you can choose a large fish tank. Generally, a 1.2-meter fish tank can raise two 40 cm fish tanks and five 10 cm fish tanks. When they grow up, it is recommended to replace them with larger fish tanks.

Koi is a kind of carp, and carp belongs to stomach-free fish, which digests quickly, so it will be eaten all the time, and it is rare to eat full, but frequent feeding will lead to enteritis and other diseases, and a large amount of residual bait will pollute the water body when it falls into the water, which is harmful to the health of fish. Therefore, it is necessary to control the food intake and eat it within 5-10 minutes after each feeding.

Although koi fish is a wide-temperature fish, too low temperature will also affect its vitality and appetite, so it is best to control the temperature properly. Especially in winter, the temperature should not be lower than 5 ℃, otherwise the fish may sleep, and the low temperature will also reduce its resistance, which makes it easy to get sick. It is best to keep the water temperature at 20 ℃ at ordinary times.

As mentioned above, koi fish has a high demand for oxygen, so it must be kept oxygenated during feeding. If oxygen is insufficient, it is easy to float. Prepare an oxygen pump, put the air head in the fish tank, and turn it on 24 hours a day, so as to avoid the situation that dissolved oxygen is too low.