Fritz Biodome Ceramic Fish Filter Media is a high-quality media that helps create and maintain a healthy, well-balanced bio-filter within your aquarium. The media boasts an 80%-90% porosity with an exceptionally large surface area, ideal for the growth and development of beneficial bacterial colonies. These colonies are essential for the health and success of aquariums, as the nitrifying and heterotrophic bacteria help reduce and eliminate harmful ammonia, nitrite and phosphate. Best of all, the shape and design of the media allows water to easily flow through the dome pieces without causing buildups or clogs. This is also great for use with turtles, tortoises, amphibians, and invertebrates.