The video shows a small fish with a black and white body and a long tail swimming around in an aquarium. The fish is seen swimming near the surface of the water and among the green plants that are growing in the tank. The plants have long leaves and are of various shades of green. The water in the tank is clear, and there are no other visible fish or objects in the video. The fish appears to be alone in the tank and is the main focus of the video.