Each day, coral reefs quietly reshape the microscopic world drifting just above them. As daylight fades and returns, the smallest ocean organisms — bacteria, algae, and single-celled predators — appear and disappear in a steady cycle that…

Each day, coral reefs quietly reshape the microscopic world drifting just above them. As daylight fades and returns, the smallest ocean organisms — bacteria, algae, and single-celled predators — appear and disappear in a steady cycle that…