Check the listing for details. CaribSea Purple Up 1 Gallon Coralline Algae Accelerator Saltwater Reef Aquarium. Condition: New. Listed at 124.99 USD. CaribSea Purple Up Coralline Algae Accelerator 1 Gallon Purple Up uses a unique dual method approach to coralline algae acceleration. This approach is so unique that Purple Up has been awarded a US patent. 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. Purple Up also replenishes iodine; an essential element for coralline algae tissues that quickly becomes depleted in closed systems. Purple Up is not a fertilizer, it does not promote the growth of nuisance algae. CaribSea Purple Up is used to grow coralline algae in marine aquariums and to boost calcium levels in reef aquariums. Accelerates desirable pink and purple coralline algae growth. Brings out the vibrant colors in your live rock!Wont encourage growth of nuisance algae.One bottle of Purple Up replaces multi-product recipes for coralline algae! Unique, single-bottle formulation immediately raises dissolved calcium levels and targets live rock surfaces. Replenishes iodine levels and won't encourage nuisance algae growth. Directions Shake well before use! Add 1 capful (5ml) per 50 gallons no more than once daily. Place in the sump, near a powerhead outlet, or any high flow area of the system for rapid dispersal. Purple uptm will cause some temporary cloudiness. Check calcium levels regularly. Adjust dosage of purple uptm to maintain calcium levels between 380 ppm and 420 ppm (380 mg/l to 420 mg/l). Do not exceed 420 ppm on a regular basis or significant precipitation will occur. (important! Wait at least 1 hour after using purple up to test calcium levels or erroneously high calcium levels may be indicated.)