Koi is a large ornamental fish, so the feeding container should not be small, and it should be at least 1 meter long fish tank. In this way, there is enough space in the fish tank, so that the fish can move better. If the fish tank is too small, the growth of fish will be limited to some extent, which is unfavorable to its development. In addition, the fish tank should have a certain depth, too shallow water can't raise koi.

Koi is an omnivorous fish, and there are many things to eat. If it is raised artificially, it is usually necessary to feed animal feed or synthetic feed. The former must be clean and hygienic, otherwise it may make fish sick, especially live bait. The risk of feeding synthetic feed is lower, but attention should be paid to controlling the feeding amount, so as not to feed too much and cause fish to suffer from diseases.

It is necessary to change water regularly to raise koi fish, usually every five to seven days, and it is enough to change one quarter of the total amount each time. Changing water can improve the water quality and ensure the cleanliness of the water body, which is particularly critical for the growth of fish. If the water is not changed for a long time, the ammonia nitrogen content in the water will increase, which will poison the fish.

Because koi fish is relatively large and has a high demand for oxygen, it is necessary to oxygenate the water at all times. Usually, the oxygen pump should be turned on 24 hours a day. If the feeding density is not very high, it can be turned on in stages, and it can be turned on for two hours in the morning and afternoon.