Coral reefs are the one of earths most complex ecosystems, containing over 800 species of corals and one million animal and plant species. Here we see a shallow coral reef consisting of Rabbitfish (Siganus insomnis) above a large Leafy Cup coral (Tubinaria reniformis). This is a colony of columns on encrusting bases. 75% of the worlds coral reefs are now classed as 'Threatened,' with 60% of most reefs having local damage from anchors, overfishing, coral bleaching, disease and pollution. Footage obtained whilst scuba diving at Ko Haa, Andaman Sea, Krabi, Thailand.