The video shows a group of small fish swimming in an aquarium. The fish are orange in color and are of the same species. They are swimming around a white cylindrical object that is placed in the center of the aquarium. The aquarium is also decorated with green plants and has a dark background. The fish are moving around the cylindrical object, sometimes swimming in groups and other times swimming individually. The water in the aquarium is clear, and the lighting is bright, making the fish and their movements clearly visible.