The video shows a vibrant underwater scene with a variety of fish swimming around a coral reef. The fish are of different sizes and colors, including blue, orange, and black. The coral reef is made up of various types of coral, including brain coral and staghorn coral, which are illuminated by a purple light. The fish are seen swimming in and out of the coral, creating a dynamic and lively atmosphere. The water is clear, and the lighting highlights the natural beauty of the underwater ecosystem.