1. Reason: Zebrafish has been swimming at the bottom of the tank because the water temperature is too low, although zebrafish can adapt to a wide range of water temperatures. But if the water temperature is too low, their appetite and activity will decrease. The temperature at the bottom of the fish tank will be higher than that at the top, so they will choose to move at the bottom of the fish tank.

2. Solution: Breeders need to use heating rods to keep the water temperature between 24-26 ℃. In this temperature range, their appetite and activity are the best, and their growth speed is also the fastest.

1. Reason: Zebrafish has been swimming at the bottom of the tank, which may be caused by poor water quality, although their requirements for water quality are not high. But too much garbage in the water will also affect their normal development.

2. Solution: Breeders need to change water for them first to ensure that they grow in a comfortable environment. Then open the filter or fish out the garbage in the fish tank with a net to avoid the deterioration of water quality. Change water regularly at ordinary times, so as to keep the water quality clean.

1. Reason: Zebrafish swim at the bottom of the tank all the time. It may also be sick. When they get sick, their physical strength will decline, so they will always move at the bottom of the tank.

2. Solution: Breeders need symptomatic treatment according to their manifestations and causes. After the disease is cured, they will return to their original state.