The video shows a large group of fish swimming in a tank. The fish are mostly silver in color, with some having a slight pinkish hue. They are of various sizes, but all appear to be similar in shape and species. The tank is filled with clear water, and the fish are swimming around actively. There are no other objects or creatures visible in the tank. The fish move in different directions, some swimming towards the camera while others move away. The lighting in the tank is bright, making the fish's scales shimmer as they move.