The reasons why fish keep scurrying around in the tank:

1. The environment is not suitable. New fish will feel uncomfortable in the new environment after entering the tank. The slightest movement will frighten them and cause them to run around in the tank.

2. Water quality is too poor. In the process of raising fish, you need to change the water regularly. If the water is not changed for a long time, the water quality will deteriorate seriously, and the fish will move around when they feel uncomfortable.

3. Change water frequently. If the water is changed too frequently or the water is changed too large each time, the new water will also cause the fish to be stimulated and move around.

4. New fish enter the tank. If you need to put new fish into the tank, the previous fish will be easily frightened and will run around in the tank.

Methods to deal with fish that keep running around in the tank:

1. Stable environment. The fish tank needs to be placed in a dark environment to rest, and do not let it continue to be frightened. Do not feed new fish within 2 to 3 days after they arrive, and ensure that the water temperature is constant.

2. Change the water regularly. During the breeding period, change the water every 2 to 3 days, and replace a quarter of the water in the tank each time.

3. Isolation of new fish. New fish need to be isolated, and isolation boards can be placed in the tank to avoid encounters with other fish. After 3 to 5 days of adaptation, remove the partition.