World Wide Imports Nature's Ocean Premium Marine Substrate - Samoa Pink Sand #0 20 lbs

Benefits of Nature's Ocean® Reef Sustrates:
•Ideal for reef system tank bottoms
•Denitrifying anaerobic beds 
•Extremely high surface area filter media
•Increases Carbonate Hardness
•Reduces Nitrates
•100 % From The Ocean Floor
•Maintain pH
•Provide Marine Trace Elements
•Heat Sterilized
•Ideal for culturing Live sand

Recommended:
Use at a rate of 10lbs per square foot of the tank floor's bottom area which yields about a 1" deep covering. Depending on your needs or preferences the depth may vary from 1/8" to 3"s of covering.