In the video, we see a group of fish swimming in a large tank. The fish are of various sizes and colors, and they are swimming around in the water. The tank appears to be well-lit, and the water is clear, allowing us to see the fish clearly. The fish are moving around in different directions, some swimming towards the camera and others away from it. There are no other objects or creatures visible in the tank, and the focus is solely on the fish and their movements.