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Sourced naturally, shaped by sand and mortar in regular shapes. Contains calcium carbonate which buffers your aquarium water. Perfect porous structure for colonisation of beneficial bacteria. Unique shape and can be bonded together to form complex shapes and overhangs CORALLINE - HYBRID: This rock is a hybrid between the Premium Shelf and the ReefSaver. It comes from specific localised areas of the ancient reef and forms some unusual natural shapes which also have a degree of plate formation.