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 having a spiky appearance and others a smooth, rounded shape. The reef is surrounded by sand and other marine life, such as small fish and anemones. The water is clear, and the lighting in the aquarium highlights the vibrant colors of the coral.