Purple-Upô is a new pink and purple coralline algae accelerator. Since Purple-Upô is not a fertilizer; it does not promote the growth of nuisance algae. How does it work? Purple-Upô 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 Calciumô (a 10 micron aragonite powder derived from natural seawater) targets the live rock surface. Super Sea Calciumô dissolves instantly; delivering calcium, strontium, magnesium, and carbonate right where itís needed. Purple-Upô also replenishes iodine; an essential element for coralline algae tissues that quickly becomes depleted in closed systems. Purple-Upô is an excellent addition to any aquarium with stony corals too! One bottle of Purple-Upô replaces the typical multi product recipe for successful coralline algae growth favored by advanced aquarists.