The video shows a large aquarium filled with water and a variety of fish. The fish are swimming around in different directions, some near the top of the tank and others near the bottom. The aquarium is well-lit, and the water is clear, allowing for a good view of the fish. The fish vary in size and color, with some being brightly colored and others more subdued. The aquarium appears to be well-maintained, with no visible algae or debris. The fish seem to be healthy and active, moving around freely in the tank.