The video shows a group of small fish swimming in an aquarium. The fish are silver in color and have a streamlined shape. They are swimming in a school, moving in the same direction. The aquarium is decorated with rocks and shells, which are of various sizes and colors, including white, brown, and orange. The fish are swimming around the rocks and shells, creating a dynamic and lively scene. The water in the aquarium is clear, allowing for a good view of the fish and their surroundings.