If the goldfish is in this situation, it may be due to lack of oxygen or it is eating. In order to prevent the goldfish from being hypoxic, the density of the fish needs to be controlled. Don’t feed too much each time. Uneaten food will consume the oxygen in the water. When changing the water for goldfish, the water temperature must be controlled, otherwise it will affect the health of the goldfish.

Tip:

Goldfish is the easiest species to raise among all ornamental fish. Novice parents can practice their skills by raising goldfish.