Red Sea Fish Pharm ARE11220 Coral Pro Marine Salt for Aquarium, 55-Gallon Coral pro salt is the ideal salt mix for reef aquariums, encouraging accelerated, healthy growth and enhanced vitality of all corals All corals build their skeletons by absorbing the major, minor and trace elements that they need from the surrounding water Shown that the ratio between calcium/magnesium/carbonates is paramount for the corals to efficiently takes these elements from the water and grow Provides the basis for accelerated healthy growth of all soft, LPS and SPS corals and is particularly recommended for growing out SPS coral frags Available in 55-gallon pail