Upstairs, I searched online. The most important thing to raise koi fish is raising+space+oxygen+maintaining water quality. Feeding the fish is very simple. Feed the fish with the right amount of feed (there is space in the instructions for buying fish food, so I won't explain it again). This space is very important. If you keep it in a small pot, it will be affected by the environment, so it won't grow. You see, the lake environment in the park is far less than that at home, but it is very big. Big space can make you grow! Oxygen, oxygen is also important. Ensure oxygen. Fish can live in high density, raise guys like koi fish and eat more Dora. Always turn on the filter pump for a long time. To sum up, the point is to have more space, if you are a small fish tank. You just hope it doesn't shrink.