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, and some are swimming near the surface while others are near the bottom of the tank. The tank seems to be indoors, and there are no other objects or people visible in the video.