How to deal with arowana falling off scales when it hits the tank:

1. Raise it alone. The arowanas need to be raised separately first, and then the injured fish should be cleaned with potassium permanganate solution.

2. Keep the environment stable. The surrounding environment needs to be kept stable, the water temperature should be kept between 28-30°C, and the water quality should be kept clean and refreshing. Try to reduce the frequency of water changes and preferably install a filter to slow down the deterioration of water quality.

3. Keep the environment quiet. You need to keep the surrounding environment quiet, and then add some coarse salt after they are stable to avoid infection in the areas where the scales have fallen off. If the fright is severe, it is best to cover them with a black cloth and wait for them to recover.

4. Feed in appropriate amounts and at the right time. Choose appropriate feeding methods for all fish in the tank to reduce fish competition for food.

5. Install safety facilities. Wrap the area in the fish tank where the arowana can be injured with a hose to increase resilience and reduce damage.