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Saltwater Decorations CaribSea LifeRock Shapes & Arches CaribSea LifeRock Arches and Shapes are made of an aragonitic base rock, instead of the typical cement used by some other artificial rock creators. Every rock contains a network of micro and macro pores that intertwine within the rock's internal structure, creating the perfect environment for natural nitrifying bacteria. Two Little Fishies STAX Rock Two Little Fishies STAX Rock is flat, porous oolitic limestone for building layered aquascapes.