Watch your aquarium burst with pink and purple blooms using CaribSea PurpleUp Aquarium Solution. This supplement encourages the growth of healthy pink and purple coralline algae. It provides calcium， iodine and other trace elements essential for healthy reef aquariums. Each bottle contains ionic calcium to help improve dissolved calcium levels in your tank. It also replenishes iodine， an essential element for coralline algae that often depletes quickly in closed systems. PurpleUp lets you enjoy more beautiful flora in your tank without encouraging the growth of nuisance algae.