Aspect: Colonies usually form a light brown mass covered in darker small-diameter corallites (less than 5mm in diameter). An encrusting coral, aspect and shape of a colony largely depend on substrate surface (can be flat or boulder). Corallite density may vary dramatically. Population: Common, often home to fanworms and Christmas Tree Worms. Notable feature: Tentacles are often extended during the day. Their retraction tends to cause a change of colour of the affected area, hence the English name given to this coral. The corallites and their septa barely emerge from the coral surface. Environment: Almost anywhere around Ilets Pigeon. Behaviour: Tentacles immediately retract if approached too closely, which contributes to dramatically change the surface aspect and coral of the coral.
