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 decorated with green plants and rocks, creating a natural environment for the fish. The water is clear, and the lighting is bright, allowing for a good view of the fish and their surroundings. The fish seem to be healthy and active, moving around the tank with ease. The video captures the peaceful and serene atmosphere of the aquarium, with the fish swimming calmly and gracefully.