Purple-Up™ - Purple-Up™ is a new pink and purple coralline algae accelerator. Since Purple-Up™ is not a fertilizer, it does not promote the growth of nuisance algae. How does it work? Purple-Up™ 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 powder 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. Purple-Up™ also replenishes iodine; an essential element for coralline algae tissues that quickly becomes depleted in closed systems. Purple-Up™ is an excellent addition to any aquarium with stony corals too! One bottle of Purple-Up™ replaces the typical multi product recipe for successful coralline algae growth favored by advanced aquarists.