The video showcases a beautifully decorated aquarium with a variety of colorful fish swimming around. The aquarium is filled with coral reefs of different shapes and sizes, creating a vibrant underwater landscape. The fish are seen swimming in and out of the coral, some hiding behind the rocks while others swim in the open water. The colors of the fish range from bright yellows to deep blues, and the coral reefs display a range of colors from green to purple. The water is clear, allowing for a good view of the fish and coral.