The video shows an aquarium with several fish swimming around. The fish are of different sizes and colors, including black, white, and gray. The aquarium is decorated with green plants and rocks. The fish are seen swimming around the tank, some of them hiding behind the plants while others swim in the open water. The lighting in the aquarium is bright, making the colors of the fish and the plants stand out. The water is clear, and the fish are moving smoothly through it.