BRS Refractometers are very accurate and great for checking your specific gravity.  Salinity in your aquarium is one of the most important things to check.  This Refractometer comes with calibration fluid.

Sand is not only for decoration but for health of your system.  Providing a beneficial filtration that will help control Nitrate. 

Reef Crystal salt is a special mix made just for the reef aquarium.   With higher amounts of Calcium, Alkalinity, and Magnesium compared to other brands. 

Use a Instant Ocean Hydrometer to test your salinity or specific gravity of your aquarium.  Refractometers are better suited and more accurate but also little more expensive.  These are great for a quick check of your parameters.

SSA Refractometers are very accurate.  Sea Side Aquatics Refractometers do not come with calibration fluid and is sold seperately.

Reef Crystal salt is a special mix made just for the reef aquarium.   With higher amounts of Calcium, Alkalinity, and Magnesium compared to other brands.