Coral Polyps

http://animals.nationalgeographic.com/animals/photos/corals/#/reef_3322_600x450.jpg

Pillar Coral (daylight feeding)

http://www.buoyancyquest.com/gallery6.htm

A healthy coral mound of pillar coral

http://coastal.er.usgs.gov/education/crisis/corals/corals4.html

Pillar corals providing a natural home for marine life

http://www.fla-keys.com/diving/divingparadise.cfm