The video shows a group of small fish swimming in a tank. The fish have black and white stripes and are of the same species. They are swimming around green plants and rocks in the tank. The water is clear, and the lighting is bright, making the colors of the fish and plants stand out. The fish are moving in different directions, some are swimming near the surface while others are near the bottom of the tank. The plants are swaying slightly due to the movement of the water.