The video shows a large fish tank with various types of fish swimming around. The tank is filled with water and has a blue light shining from above. The fish are of different sizes and colors, and they swim around the tank, sometimes hiding behind the coral and other times swimming in the open water. The coral in the tank is of different shapes and sizes, and it provides a home for the fish. The video captures the peaceful and serene environment of the fish tank, with the fish moving around in a relaxed manner.