Provide your reef with all the important nutrients they need while maintaining proper pH with Kent Marine Nano Reef Part A & B Reef Aquarium pH Treatments. Marine reef inhabitants require calcium， magnesium， strontium， iron and other elements found in natural salt water. When used together， Kent Marine Nano Reef Part A & B Reef Aquarium pH Treatments provides all the necessary major， minor and trace ions in proper ratios to maintain proper water parameters in nano reefs and other small reef systems. This easy-to-use， two-part liquid system simplifies reef supplementation for healthy coarl and invertebrate growth.