The video shows a group of fish swimming in a coral reef. The fish are yellow and white in color and are swimming in a school. The coral reef is green and brown and is home to various types of marine life. The water is clear and blue, and the sunlight is shining through, illuminating the fish and the coral reef. The fish are moving in a coordinated manner, and their fins are visible as they swim through the water. The coral reef is diverse, with different types of coral and marine plants visible. The video captures the beauty and complexity of the underwater ecosystem.