The video shows a group of fish swimming in a tank. The fish are of different sizes and colors, and they are swimming around the tank in different 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 around in a lively manner, and there is no visible plant life or decorations in the tank. The fish seem to be healthy and active, and there is no sign of any other creatures or objects in the tank.