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 a coordinated manner. The tank appears to be well-lit, and the water is clear, allowing for a good view of the fish. The fish are moving in different directions, some swimming towards the camera and others away from it. The tank seems to be a controlled environment, possibly a fish tank in a home or a public aquarium.