The video shows a vibrant underwater scene in an aquarium. The main focus is on a yellow fish that swims around the tank, exploring its surroundings. The aquarium is filled with various types of coral and rocks, creating a colorful and diverse environment. The fish moves gracefully through the water, occasionally darting between the coral and rocks. The lighting in the tank highlights the bright colors of the fish and the coral, creating a mesmerizing effect. The video captures the peaceful and mesmerizing beauty of underwater life.