The video shows a group of fish swimming in a tank. The fish are of different sizes and colors, and they are swimming around the tank in various directions. The tank appears to be made of glass, and there is a white border at the top of the tank. The fish are moving in and out of the frame, and some are swimming close to the camera while others are further away. The water in the tank is clear, and the lighting is bright, making it easy to see the fish and their movements.