For our reef ceramics we use raw materials of the highest quality without artificial additives. Each product is unique and is made by hand. The highly porous structure of our reef ceramics is an ideal settlement substrate for bacteria, which ensure the nutrient degradation. Due to the uniformity of the structure, this is even superior, but very massive living rock, superior. Should not be the right reef ceramics in the assortment, give us the measurements and ideas and after about 3 to 4 weeks your desired ceramics are ready! Available in the following sizes: • p • M • L