In the video, a person is seen cleaning a fish tank with a net. The tank is filled with water and has several fish swimming around. The person is using the net to remove debris from the tank, ensuring that the fish are safe and healthy. The fish are of different sizes and colors, and they swim around the tank, occasionally coming close to the net. The person is careful not to harm the fish while cleaning the tank. The video provides a glimpse into the daily care and maintenance required to keep a fish tank healthy and thriving.