The video shows a large fish tank with a variety of fish swimming around. The fish are of different sizes and colors, and they are swimming in different directions. The tank has a blue background and is filled with water. There are rocks and plants in the tank, and the fish are swimming around them. The fish are moving in and out of the frame, and some are swimming close to the camera while others are further away. The lighting in the tank is bright, and the water is clear.