PurpleUp - uses a unique dual method approach to coralline algae acceleration. This Approach is so unique that PurpleUp has been awarded a US patent US patent No. 7,565,883. It contains ionic calcium; which immediately raises dissolved calcium levels in your aquarium water. At the same time Super Sea Calcium a 10 micron aragonite powder derived from natural seawater targets the live rock surface. This dissolves in situ; delivering calcium, strontium, magnesium, and carbonate right where it's needed. PurpleUp also replenishes iodine; an essential element for coralline algae tissues that quickly becomes depleted in closed systems. PurpleUp is not a fertilizer, it does not promote the growth of nuisance algae.