The video shows a group of fish swimming in an aquarium. The fish are of different sizes and colors, and they are swimming around in the water. The aquarium is well-lit, and the fish are moving around freely. The water is clear, and the fish are seen swimming near the bottom of the aquarium. The fish are of various species, and they are all swimming in different directions. The aquarium is decorated with plants and rocks, and the fish are swimming around these decorations. The video captures the peaceful and serene environment of the aquarium, with the fish moving gracefully in the water.