I used to raise this kind of fish in the factory. A flower pond was also built in front of the building. There are lotus flowers with small leaves growing inside. But our water is constantly flowing. We have a fish farm in our factory, and we have special feed. The koi grow very fast, and the seedlings are released in spring. In autumn, it weighs more than one pound. You must have an oxygen pump to raise this kind of fish. Otherwise, if it cannot be raised for a long time, it will die due to lack of oxygen. Never put aquatic plants in the fish pond. It will compete with fish for oxygen in the water. You only have 1.5 square meters and can only raise five to six carp weighing one pound. If it’s too much, you still have to change the water twice a day! In addition, you can put a few loach fish in the fish pond, which can eat carp feces.