The video shows a large aquarium filled with water and several fish swimming around. The fish vary in size and color, with some being larger and more vibrant, while others are smaller and more subdued in color. The aquarium is well-lit, and the water is clear, allowing for a good view of the fish and their movements. The fish are seen swimming in different directions, some near the top of the tank and others near the bottom. The aquarium appears to be well-maintained, with no visible debris or algae.