This is an ultra realistic Coral made of silicone that sits at the bottom of the aquarium. Each of its branches sway with the water current just like the real thing. The color on top emits light when near an LED light and looks beautiful. Fish love to play with this decoration. It is totally harmless to all fish and is very easy to clean and maintain. All you need to do is place it on the bottom of the aquarium and you have your very own coral reef.