The video shows a group of fish swimming in a tank filled with water. The fish are of different sizes and colors, and they are swimming around the tank in various directions. The tank appears to be well-lit, and the water is clear, allowing for a good view of the fish. The fish are moving smoothly and gracefully, and there is no visible plant life or other objects in the tank. The video is shot from a side angle, giving a clear view of the fish and their movements.