PurpleUp is a new pink and purple coralline algae accelerator. Since purpleup is not a fertilizer, it does not promote the growth of nuisance algae. How does it work? Purpleup uses a unique dual method approach to coralline algae acceleration. 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 powered derived from natural seawater) targets the live rock surface. Super Sea Calcium 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 become depleted in closed systems. Purpleup is an excellent addition to any aquarium with stony corals too! One bottle of purpleup replaces the typical multi product recipe for successful coralline algae growth favored by advanced aquarists.