The video shows a group of yellow fish swimming in an aquarium. The fish are of various sizes and are seen swimming around the tank, which is decorated with rocks and gravel. The water is clear, and the fish appear to be healthy and active. The lighting in the tank highlights the vibrant yellow color of the fish, making them stand out against the darker background of the rocks and gravel. The fish move gracefully through the water, occasionally darting in and out of the rocks. The aquarium seems to be well-maintained, with no visible signs of algae or debris. Overall, the video captures a peaceful and serene scene of aquatic life.