Five brocade carp in a 1-meter fish tank is almost the same. Koi is a large ornamental fish, so it should be raised in a larger fish tank. If the fish tank is too small, it will often affect the activities of the fish, and even lead to the fish growing up. In addition, this kind of fish has miscellaneous feeding habits, low temperature requirements and strong adaptability, so it is not difficult to raise it. As long as the dissolved oxygen in the water body is sufficient, there will basically be no big problems.

1. Adequate oxygen: Although koi lives in water, its demand for oxygen is still relatively large. When oxygen is insufficient, it may die immediately. Furthermore, the density of feeding fish is relatively high, and they all need oxygen, so oxygen is easy to be insufficient. When oxygen is insufficient, oxygen should be given in time.

2. Good water quality: Koi can't live without water. Good water quality makes Koi live longer. If water contains chlorine and ammonia poison, they will be poisoned. To prevent toxins in water bodies, we must change water frequently, once every three days, and expose to the sun for three days before changing water to remove chlorine.

3. There is food: Koi is a kind of fish that is easy to raise in general, and its feeding habits are miscellaneous. However, if the food fed lacks nutrition, it will not grow fast, its resistance will decrease, and it will easily get sick and die. When choosing food, we must ensure the quality and healthy eating of koi.