The video captures a vibrant underwater scene in an aquarium. It features a variety of fish swimming around the tank, including a large fish with black and yellow stripes, a blue fish with a white belly, and a yellow fish with black stripes. The fish are seen swimming near the coral reefs, which are covered in algae and other marine life. The water is clear, and the lighting highlights the colors of the fish and the coral. The video provides a close-up view of the fish and their movements, showcasing the beauty and diversity of the marine life in the aquarium.