The video shows a close-up of a coral reef in an aquarium. The reef is made up of various types of coral, including brain coral and staghorn coral. The colors of the coral range from bright orange to deep purple, with some coral exhibiting a mix of both colors. The coral is attached to a rock formation, and there is a small fish swimming around the reef. The water in the aquarium is clear, and the lighting highlights the vibrant colors of the coral.