This video showcases a vibrant underwater ecosystem. The footage begins with a school of blue fish swimming in unison near a coral reef. The fish have a sleek, streamlined body shape and are predominantly blue in color, with some displaying hints of yellow. The reef itself is a bustling hub of marine life, teeming with various corals and other sea creatures.  As the video progresses, the scene shifts to a different school of fish, this time with a more yellow hue. These fish are also swimming in a coordinated group, navigating through the coral structures. The coral reef in this scene is equally diverse, with a mix of hard and soft corals, providing a complex environment for the fish to explore.  Throughout the video, the camera captures the fluid movements of the fish as they weave in and out of the coral structures, highlighting the symbiotic relationship between the marine life and their habitat. The clear blue water provides a stunning backdrop to this underwater tableau, enhancing the visual appeal of the scene.  Overall, this video offers a glimpse into the rich biodiversity of a coral reef ecosystem, showcasing the beauty and complexity of underwater life.