The video shows a colorful coral reef in an aquarium. The reef is home to a variety of fish and coral, creating a vibrant underwater landscape. The fish are swimming around the reef, exploring their environment. The coral is in various shapes and sizes, with some resembling brain coral and others resembling staghorn coral. The colors of the coral range from bright oranges to deep purples, adding to the overall beauty of the scene. The aquarium appears to be well-maintained, with clear water and healthy-looking coral.