CaribSea Aquatics Rubble Zone， 6 lb/1 gallon</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Aragonitic calcium carbonate rubble for assorted aquarium uses</li><li>Use to aquascape， support aquarium biological filtration and more</li><li>Great for use in refugiums， marine aquariums， cichlid tanks and ponds</li></ul></div></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/41whdlKbGLL.jpg' noproxy></br>