The video shows a large aquarium with a variety of colorful fish swimming around. The fish are of different sizes and shapes, and they are swimming in different directions. The aquarium is well-lit, and the water is clear, allowing for a good view of the fish and the coral reefs. The coral reefs are brightly colored and appear to be healthy. The fish are swimming calmly, and there is no sign of any aggression or stress among them. The overall atmosphere of the video is peaceful and serene.