Sea urchins play an important role in the ocean’s ecosystems, but scientists say their numbers have dwindled drastically since the 1980s when a mysterious disease struck. University of Florida Professor Josh Patterson says sea urchins graze on and clean a type of algae that competes with coral, and their decimation is a big reason for the decline of the coral reef ecosystem in the Caribbean, but he has a plan for their comeback. Inside Edition Digital’s Mara Montalbano has more.