In this video, two koi fish are swimming in an aquarium. One is a bright orange and white, while the other is primarily white with some orange markings. The fish are near the surface of the water, where a stream of water is being poured in from the top left of the frame. Bubbles are rising from the water's surface where the water is being added. The aquarium has a dark substrate at the bottom, and the water appears somewhat murky. The light source is from above, illuminating the surface of the water and the fish.