The video shows a close-up of two fish in a tank. The fish are swimming around and moving their fins. The water in the tank is clear, and there are bubbles visible on the surface. The fish are of different sizes and colors. One fish is larger and has a greenish-brown color, while the other is smaller and has a yellowish color. The larger fish is swimming around the smaller fish, which is stationary. The background of the tank is not visible, but the focus is on the fish and their movements.