From a website:
The bizarre phenomenon of mass coral spawning occurs throughout the Caribbean, but scientists generally agree that the "big bang" at the Flower Garden Banks is more intense than anywhere else. If you want to be front and center for the action, there's no better place to be than here on the eighth night after the August full moonat 9:15 p.m., to be exact. That's when seven different species participate in a mass orgy that resembles an upside-down snowstorm. Billions of BB-size bundles of gametes erupt from coral polyps and gradually float to the surface where they combine to form new corals.
) It's suppose to be pretty amazing!!
Photos!!! 
