The video shows a group of fish swimming in a tank. The fish are of different sizes and colors, and they are swimming around each other. Some of the fish are black, while others are white with black stripes. The tank is filled with water and has rocks and plants at the bottom. The fish are moving around the tank, some swimming near the surface while others are near the bottom. The water is clear, and the lighting in the tank is bright, making the fish's colors stand out.