Coral sand

What is it?

Coral sand is a mostly white medium fine crushed coral and shells (though sometimes Aragonite is added). The shells of freshwater or marine invertebrates is made of [Limestone], the mineral calcite (calcium carbonate CaCO3).

• Designed to slowly add calcium and carbonate to the water.

What is it used for?

1. To make a substrate for an aquarium tank.
2. To add calcium to the water to increase the GH levels.
3. To add carbonate to the water to increase the KH levels. Typically to buffer soft water and to raise pH.

How much to use?

Approximately 1 handful per 10 Litres (2.6US G.) spread over the substrate.

Links

• Coral Sand
• Limestone