The video shows a large fish swimming in a tank with other fish. 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 calmly, and there is no visible aggression or stress among them. The tank seems to be well-maintained, with no visible algae or debris. Overall, the video provides a peaceful view of fish in a tank.