1. Reason: Goldfish may turn over their stomachs because of hypoxia. At the beginning of hypoxia, they will not turn over their stomachs, but only breathe heavily. When they are deprived of oxygen for too long, they will turn over their stomachs.

2. Treatment: Breeders need to install an oxygen pump to ensure sufficient dissolved oxygen in water. At ordinary times, we should change water and get oxygen regularly, so as to avoid their lack of oxygen.

1. Reason: Goldfish tummy may also be caused by indigestion. When they eat too much food and cannot digest it quickly, the food accumulated in their stomach will cause flatulence. If there is too much air in the abdomen, they will turn over.

2. Treatment: The breeder needs to stop feeding them immediately and raise the water temperature to about 28 ℃. High temperature can speed up their metabolism, and when they digest the food in their bodies, the situation of tumbling can be alleviated.

1. Reason: Goldfish tummy may also be due to imbalance of fish body, and there are many reasons for imbalance of fish body. For example, food scratches internal organs and inflammation of internal organs will lead to imbalance of their swim bladders.

2. Treatment: Breeders need to put them in shallow water first, and it is best to make a splint for them to keep their body balanced. Finally, use anti-inflammatory medicine bath to speed up their recovery.