In the video, a purple fish is seen swimming around in a fish tank. The fish has a vibrant purple color and appears to be healthy and active. The fish tank is well-lit, and the water is clear, allowing for a good view of the fish. The fish moves gracefully around the tank, occasionally coming close to the camera. The tank appears to be well-maintained, with no visible debris or algae. The fish's fins and tail are in motion, indicating that it is swimming at a steady pace.