The video shows a green fish swimming in and out of a hole in a coral reef. The reef is covered in various types of coral, including brain coral and staghorn coral. The fish has a long body and a pointed snout, and it moves gracefully through the water. The coral reef is vibrant and colorful, with hues of green, blue, and pink. The water is clear, and the sunlight filters through, casting a beautiful glow on the reef.