The video shows a vibrant underwater scene in an aquarium. The main focus is a clownfish with its distinctive orange, white, and black stripes, swimming around a large coral reef. The coral reef is teeming with life, featuring various types of coral in shades of purple, pink, and green. The water is clear, and the lighting enhances the colors of the fish and coral. There are also other fish swimming around the reef, but the clownfish is the most prominent.