The video shows a blue tang fish swimming in an aquarium. The fish has a bright blue body with a yellow tail and fins. It swims around the tank, which is filled with various types of coral and other fish. The blue tang fish is the main focus of the video, and it moves gracefully through the water. The aquarium is well-lit, and the colors of the fish and coral are vibrant and clear. The video does not contain any text or subtitles.