The video shows a group of fish swimming around in an aquarium. The fish are of different sizes and colors, and they are swimming around a piece of white cloth that is hanging from a string. The aquarium is well-lit, and the water is clear, allowing for a good view of the fish and their surroundings. The fish seem to be curious about the white cloth and are swimming around it, occasionally nibbling on it. The aquarium is decorated with rocks and plants, creating a natural habitat for the fish.