The reasons why Arowana collides with the tank:

1. Water quality problem: Arowana likes an environment with clear water and good circulation. If the water quality in the tank is not good, it will cause The fish exhibits abnormal behavior, such as bumping into the tank, etc.

2. Tank problems: If the tank is too small or has problems with its shape or material, it will easily make the arowana feel uncomfortable and lead to abnormal behavior.

3. Breeding problems: For example, over-breeding leads to insufficient space, or fights between arowanas may cause anxiety and tension, resulting in abnormal behaviors such as tank collision.

4. Improper cleaning of the bottom: If there are too many debris at the bottom, it will not only affect the water quality, but also make the arowana feel uncomfortable, resulting in abnormal behaviors such as collision with the tank.

5. Lighting problem: Too strong or too dark light will cause the arowana to be uncomfortable and prone to abnormal behaviors such as collision with the tank.

6. Disease factors: Arowana may suffer from some diseases, such as parasitic infection, bacterial infection, etc., which will also make it feel uncomfortable, resulting in abnormal behaviors such as bumping into the tank.