The video features a group of fish swimming in an aquarium. The fish are of different sizes and colors, and they are swimming around the tank in various directions. The aquarium is well-lit, and the fish appear to be healthy and active. The water is clear, and the tank is decorated with rocks and plants, creating a natural habitat for the fish. The fish are seen swimming near the surface, as well as deeper in the tank. The video captures the peaceful and serene environment of the aquarium, with the fish moving gracefully through the water.