Despite the name, coralline is a macroalgae. This species is rigid, and calcified. Coralline is classified as a red macroalgae, this species is considered a branching form of coralline, and is different than the encrusting species of coralline typically found in aquaria.
This product is for one cluster of coralline algae, approximately 4 cubic inches. It requires calcium and bright lighting. It can spread throughout your tank under ideal conditions but is unlikely to become a nuisance. It is very slow growing. For more information on various forms of coralline, please refer to our article that can be found here.
On arrival it is common for the algae to appear pale, especially if shipped via Priority Mail. Please allow it some time to revert to a pink or purple coloration.