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, staghorn coral, and fan coral. The corals are in different colors, including purple, green, and pink. The aquarium is well-lit, highlighting the vibrant colors of the corals. There are also several fish swimming around the reef, including clownfish and tangs. The water is clear and the tank is well-maintained.