The video shows a single fish swimming in a tank. The fish is red and has long fins that it waves around as it moves. The background is dark, and the lighting is dim, but the fish is clearly visible. The fish appears to be alone in the tank, and there are no other objects or creatures visible in the video. The fish moves gracefully, and its fins undulate gently as it swims. The video is shot from a side angle, and the fish is the main focus of the video.