The video shows a group of fish swimming in an aquarium. The fish are of different sizes and colors, including shades of orange, green, and silver. The aquarium is filled with water and has a dark background, which makes the fish stand out. The fish are swimming around the tank, some near the bottom and others near the surface. The water is clear, and bubbles can be seen rising to the surface. The lighting in the aquarium highlights the fish's movements and colors.