The video shows a large group of fish swimming together in a tank. The fish are mostly dark in color, with some having lighter spots. They are swimming in different directions, creating a dynamic and lively scene. The tank appears to be well-lit, and the water is clear, allowing for a good view of the fish. The fish vary in size, but all seem to be of the same species. There are no other objects or creatures visible in the tank, and the focus is solely on the fish and their movements.