Common name: Coralline Algae

Coralline algae, belonging to the family Corallinaceae, are calcareous algae found in marine environments worldwide. They are important for reef building, as they deposit limestone (calcium carbonate) in their cell walls, contributing to the structure of coral reefs. These algae come in various colors, predominantly pink or purple, and can be encrusting or branching. They are beneficial in reef aquariums, promoting stability and providing a natural appearance. Coralline algae compete with nuisance algae for space and nutrients, helping to keep the latter in check. They require stable conditions and adequate calcium levels to thrive.

1. 
   Common name: Cryptic Branching Coralline Algae

   Scientific name: Amphiroa cryptarthrodia
2. 
   Common name: Lime Green Algae

   Scientific name: Amphiroa fragilissima
3. Common name: Hydrolithon boergesenii

   Scientific name: Hydrolithon boergesenii
4. 
   Common name: Jania rubens

   Scientific name: Jania rubens
5. 
   Common name: An encrusting coralline alga

   Scientific name: Lithophyllum incrustans