1. Reason: Zebrafish can't move at the bottom of the water because the water temperature is too low. Although they have cold resistance, they can't accept too low water temperature. When the water temperature is lower than 15 ℃, they will stop moving. Will hide at the bottom of the cylinder without moving.

2. Solution: The breeder needs to immediately raise the water temperature to 24-26 ℃ and install a heating rod to keep the water temperature constant. As long as the water temperature rises, their activity will also increase. But the temperature should not be too fast, otherwise it will make zebrafish uncomfortable.

1. Reason: Zebrafish can grow in weak acid, weak base and neutral water. But the water in which they are raised is too dirty, which will also affect their normal life.

2. Solution: Breeders need to change their water immediately, and clean up the food residues and feces in the water to prevent these garbage from polluting the water quality again. It is better to install another filter to slow down the deterioration of water quality.

1. Reason: Zebrafish are still underwater and may be caused by illness. When they get sick, their physical strength will be affected. Common colds, enteritis, water mildew, white spot disease, etc. will reduce their activity.

2. Solution: Breeders can add some crude salt to the fish tank first, which can not only sterilize but also inhibit the growth of bacteria. Then, according to their symptoms and etiology, their activity will resume after the disease is cured.