The video shows a large aquarium filled with water and several fish swimming around. The fish are of different sizes and colors, and they are swimming in different directions. The aquarium is well-lit, and the water is clear, allowing for a good view of the fish. The fish are moving around the tank, some swimming near the top while others are near the bottom. The aquarium appears to be well-maintained, with no visible algae or debris. The fish seem to be healthy and active.