The video shows a group of fish swimming in a tank. The fish are of different sizes and colors, and they are swimming around in the water. 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 different directions, some swimming near the top of the tank while others are near the bottom. The fish seem to be healthy and active, and there is no visible sign of any other objects or creatures in the tank.