The video shows a group of fish swimming in a tank. The fish are of different sizes and colors, with some being gray and others being white. They are swimming around in the water, occasionally coming close to the glass of the tank. The tank appears to be well-maintained, with clear water and no visible debris. The fish seem to be healthy and active, moving around the tank with ease. The lighting in the tank is bright, illuminating the fish and the water, making it easy to see the details of the fish and their movements.