The warning bells are ringing for another potentially killer season for Florida’s beleaguered coral reefs, sending reef restoration companies scrambling to protect their brood. While the atmospheric phenomena of El Niño is linked to a quieter hurricane season this year, it’s also cranking the thermostat on Florida’s waters. That’s bad news for corals, which get sick and even die when water temperatures stay too hot for too long. And as of this week, they’re officially too hot.