This is a very beautiful rock. Super premium quality. You will receive an assortment of Rock from around the world. Tukani Rock, Tokota Rock, Caribbean Rock and Fiji Premium rock can be in the assortment. This rock is cured and ready to become a centerpiece of your aquarium display.Once you receive your rock, you must re-cure the rock for at least a week. During shipping some of the beneficial bacteria will die off. Do not add this directly to an existing tank!