What is it?[edit | edit source]
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).
What is it used for?[edit | edit source]
- To make a substrate for an aquarium tank.
- To add calcium to the water to increase the GH levels.
- To add carbonate to the water to increase the KH levels. Typically to buffer soft water and to raise pH.
How much to use?[edit | edit source]
Approximately 1 handful per 10 Litres (2.6US G.) spread over the substrate.