Decorative Gold Fish features moving tail, it can swim in your aquarium ( The Water Must be moving in the aquarium Great for aquarium decoration, it is non toxic and not harmful to aquarium creature, providing a place for nitrobacteria Simple way to enhance any aquarium, help creates natural and realistic environment for aquatic life Unique design for the fishtail, which can be wiggling in the water for Ideal decoration for the fish for tank or aquarium