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