In the video, a person is seen using a blue brush to clean the inside of a fish tank. The brush is being moved around the tank, and the person is also using a hose to spray water into the tank. The water is clear, and the fish inside the tank can be seen swimming around. The person's hand is visible as they hold the brush and hose, and they appear to be wearing a watch. The tank is blue, and there are rocks and plants inside. The person is methodically cleaning the tank, ensuring that all areas are properly cleaned.