Marco Rocks promises to be the epitome of “reef safe.” Not only are Marco Rocks safe for reef aquariums, they are never (“never ever,” their website states) collected from a living reef.
Marco Rocks are natural calcium carbonate and quarried near Key Largo, Florida. The company promises to be a reliable base rock source for marine and reef aquaria.
Each box is hand packed by a reef enthusiast to ensure you get a nice variety for your own tank. Marco Rocks arrive to you pre-cycled to help speed the setup of new aquariums. They are porous, lightweight and have a large surface area.