The video shows a group of fish swimming in an aquarium. The fish are of different sizes and colors, and they are swimming around the tank. The aquarium is decorated with green plants and rocks, creating a natural habitat for the fish. The water is clear, and the lighting is bright, highlighting the vibrant colors of the fish and the plants. The fish are moving freely, exploring their environment, and interacting with each other. The aquarium appears to be well-maintained, with clean water and healthy-looking fish.