The video shows a close-up of a fish tank with various types of fish swimming around. The fish are of different sizes and colors, and they are swimming in and out of the frame. The tank is decorated with rocks and plants, and there is a light source that illuminates the tank, making the fish and decorations visible. The water in the tank is clear, and there are no visible signs of pollution or debris. The fish appear to be healthy and active, and they are swimming in different directions, sometimes alone and sometimes in groups.