1. Reason: Goldfish stand upside down may be stimulated by too much environmental change, although they have low requirements for the environment. However, they are sensitive to the fluctuation of the environment. When the environment in which they live changes greatly, they will have stress reaction.

2. Treatment: The breeder needs to install a heating rod to keep the water temperature in a stable range. If conditions permit, it is best to install a filter to keep the water clean. As long as the environment is stable, their handstand can be gradually alleviated.

1. Reason: Goldfish upside down may also be caused by lack of oxygen. When the oxygen content in the fish tank is low, they may turn over and stand upside down.

2. Treatment: The breeder needs to oxygenate them immediately to ensure sufficient oxygen in the fish tank. At ordinary times, we should change water regularly and clean up impurities in the fish tank. This can not only ensure sufficient oxygen, but also keep the water clean.

1. Reason: Goldfish may also suffer from fish imbalance when standing upside down, mainly because the swim bladder has lost its function. For example, food scratches internal organs, and too much food is fed, which will cause them to lose their swim bladder.

2. Treatment: The breeder needs to make a splint for them to keep their bodies balanced. It can also lower the water level and prevent them from standing upside down. Finally, they are fed some anti-inflammatory drugs, so that they can recover faster.