The video shows a close-up of a fish tank with a blue fish swimming around. The fish has a long tail and is seen swimming near the surface of the water. The tank appears to be well-maintained, with clear water and no visible debris. The fish moves gracefully, its fins and tail undulating as it navigates the tank. The lighting in the tank highlights the blue color of the fish, making it stand out against the green plants and the neutral-colored tank walls.