In the video, we see a person using a vacuum to clean the bottom of a fish tank. The tank is filled with water and has a variety of colorful pebbles on the bottom. The person is using a clear vacuum with a blue handle to suck up the debris and dirt from the bottom of the tank. The vacuum is moved around the tank to ensure that all areas are cleaned. The person's hand is visible as they hold the vacuum and move it around the tank. The water in the tank is clear, and the pebbles are of various colors including red, green, blue, and yellow. The video provides a close-up view of the cleaning process, allowing us to see the details of the vacuum and the pebbles.