In the video, a man is seen cleaning a fish tank. He is wearing a white shirt and a cap. He has a vacuum cleaner attached to a hose, which he uses to clean the bottom of the tank. The man is standing in front of the fish tank, which is placed on a wooden cabinet. The fish tank is filled with water and has a green background. The man is using the vacuum cleaner to remove dirt and debris from the bottom of the tank. The video shows the man moving the vacuum cleaner back and forth to ensure that all areas of the tank are cleaned.