In the video, a person is seen cleaning a fish tank using a net. The tank is filled with water and has several fish swimming around. The person is holding the net and moving it around in the water to clean the tank. The fish are of different sizes and colors, and they are swimming around the tank, occasionally coming close to the net. The person appears to be careful not to harm the fish while cleaning the tank. The water in the tank is clear, and the tank is well-lit, allowing for a good view of the fish and the person cleaning the tank.