The video shows a close-up of an aquarium with a light shining on it. The aquarium is filled with water and has several fish swimming around. The light reflects off the water's surface, creating a shimmering effect. The aquarium appears to be well-maintained, with clear water and healthy-looking fish. The fish are of different sizes and colors, and they swim in different directions, sometimes coming close to the camera and other times swimming away. The aquarium seems to be placed in a room with a dark background, which makes the light and the fish stand out.