Coral reefs are often called the “rain forests of the sea,” but they’re more like undersea cities for fish, eels, lobsters, and the many other organisms that live here. The workers that build these cities are the corals themselves – minuscule creatures that create a tough limestone skeleton to live in. The structures you see are the skeletons of thousands of coral polyps piled up over the centuries. Corals invite algae roommate into their limestone homes to help them survive and produce the reef’s trademark vivid colors. The algae convert sunlight to food and oxygen for the corals, which in turn nourish the algae with their waste.
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