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NATURAL AQUASCAPES — Create striking underwater landscapes with ocean rock aquarium stone naturally shaped by centuries of limestone erosion. MARINE SAFE MATERIAL — Free from nuisance algae and pests, making dry reef rock ideal for marine, reef and hard water aquariums. VERSATILE HABITATS — Suitable for reef systems, African cichlid tanks and other alkaline freshwater environments requiring stable décor. SUPPORTS BIOFILTRATION — Highly porous surfaces provide excellent space for beneficial bacteria colonisation within your aquarium hardscape. BUILD CUSTOM STRUCTURES — Pieces can be stacked and bonded together to create caves, overhangs and dramatic reef tank rock formations.