The video shows a group of fish swimming in an aquarium. The fish are of various sizes and colors, and they are swimming around the tank. The aquarium is well-lit, and the water is clear, allowing for a good view of the fish. The fish are moving around the tank, some swimming near the top while others are near the bottom. The tank appears to be well-maintained, with no visible algae or debris. The fish seem to be healthy and active.