The video shows a group of fish swimming in an aquarium. The fish are of different 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, some swimming near the top of the tank while others are near the bottom. The aquarium appears to be well-maintained, with no visible algae or debris. The fish seem to be healthy and active.