The video shows a close-up of a fish swimming in a tank. The fish is seen swimming around the tank, and the camera focuses on its movements. The fish appears to be a small, colorful species, possibly a tropical fish. The tank is well-lit, and the water is clear, allowing for a good view of the fish and its surroundings. The fish moves gracefully, and its fins and tail are clearly visible as it swims. The background of the tank is not clearly visible due to the close-up shot of the fish.