What is coral bleaching? 🪸 Watch our Chief Scientist Roger Beeden explain how coral bleaching happens. Corals get their colour from the millions of microscopic algae that grow in the coral polyps called zooxanthellae which has a symbiotic relationship with their host coral. When corals are under stress, they expel their zooxanthellae that live in their tissues which causes them to become transparent, exposing their white skeleton. This is called coral bleaching. Head to our website for more inf