D Marco Reefsaver Rock Coralline 18kg Marine Aquascaping Stone

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 - REEFSAVER: This will be your main 'go-to' rock that you will use for the construction of your custom reef .An 18Kg mixed box contains rocks that range from 10-30cm but most of the pieces will be 12-16cm size.