This all-natural aragonitic calcium carbonate base rock is the ultimate foundation for marine, reef, and African cichlid aquariums. Our special processing enhances the incredible porosity of South Seas Base Rock, and you will notice the difference. This amped-up porosity of South Seas Base Rock makes it the ideal platform for both aerobic and anaerobic bacteria for effective nitrite and nitrate control. The gnarly surfaces are the perfect area to place inverts and create interesting, stable aqua-scapes. No curing required; this clean, cost-effective, and ready-to-use rock is a must-have for any aquarist and their supplier.