The video shows a group of fish swimming in a tank. The fish are of different colors, including black, orange, and yellow. The tank is filled with water and has a blue background. The fish are swimming around, some are swimming near the top of the tank while others are near the bottom. The fish are of different sizes and shapes, some are long and slender while others are shorter and more rounded. The fish are moving in different directions, some are swimming in a straight line while others are swimming in circles. The water is clear and the fish are moving smoothly through it.