The video shows a group of fish swimming in an aquarium. The aquarium is decorated with various plants and rocks. The fish are of different sizes and colors, and they swim around the tank, occasionally interacting with each other. The water is clear, and the lighting is bright, highlighting the vibrant colors of the fish and the plants. The fish move gracefully, and their movements are smooth and coordinated. The aquarium appears to be well-maintained, with clean water and healthy-looking fish.