The video shows a group of clownfish swimming around in an aquarium. The fish are orange with white stripes and are seen swimming around the coral and other sea plants. The aquarium is well-lit, and the water is clear, allowing for a good view of the fish and their surroundings. The clownfish are of various sizes and are seen swimming both individually and in groups. The coral and plants in the aquarium are of different colors and shapes, adding to the beauty of the scene.