The video shows a group of fish swimming in a tank. The fish are of different colors and sizes, 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 fish seem to be healthy and active, and there are no signs of aggression or stress among them. The video provides a peaceful and calming view of these aquatic creatures in their environment.