The video shows a large fish swimming in a tank. The fish has a long, thin body and is swimming near the bottom of the tank. The tank is filled with rocks and plants, and the water is clear. The fish is moving slowly and gracefully, and its fins are visible as it swims. The lighting in the tank highlights the fish's scales, which are shiny and reflect the light. The fish appears to be alone in the tank, and there are no other fish visible in the video.