This video showcases a vibrant underwater scene within an aquarium. The tank is illuminated with a blue light that casts a glow on the various coral formations and fish swimming around. The coral formations are diverse in shape and size, with some resembling brain coral and others resembling staghorn coral. The fish are small and dart in and out of the coral, their scales reflecting the blue light. The water is clear, allowing for a detailed view of the marine life within the tank.