Aspect: Colonies grow into single single pillar-like colonies, but can combine into tall pyramidal structures. Tips may occasionally split. Population: Abundant Notable feature: Not to be confused with Finger Coral, which can occasionally be similar in shape, but smaller, and above all with totally differently configured colonies. Pillar Coral extends comparatively long polyps. Environment: Usually on relatively horizontal sufaces, but can grown atop an older colony or coral boulder. Behaviour: -