This video shows a group of fish swimming in an aquarium. The aquarium has a rocky background and is filled with white gravel. The fish are of different colors and sizes, with some being blue and others being purple. They are swimming around the tank, occasionally coming close to the camera. The fish are moving in different directions, and some are swimming in groups while others are swimming alone. The water in the tank is clear, and the lighting is bright, making the colors of the fish stand out.