• Natural aragonite rock
• Formed from ancient coral reefs
• Suitable for reef and marine aquariums
• Suitable for cichlid and hard water aquariums
• Clean, safe and easy to build with
• Free of nuisance algae and pests
• Large surface area for bacterial colonisation
• Bond together to form larger structures
• Low environmental impact
Recommended 1KG per 8-12L of water.