The video shows a fish swimming in a tank with a glass jar. The fish is seen swimming around the jar, which is placed on the sandy bottom of the tank. The fish appears to be a small, colorful species, possibly a tropical fish. The tank is decorated with rocks and plants, creating a natural habitat for the fish. The glass jar is transparent, allowing the viewer to see the fish swimming inside it. The fish moves around the jar, sometimes coming close to the glass and other times swimming away. The water in the tank is clear, and the lighting is bright, highlighting the vibrant colors of the fish and its surroundings.