Most reefs rely on photosynthesis via a symbiotic relationship with cyanobacteria to get energy, but the water here is too cloudy. Instead many of the sponges i

Most reefs rely on photosynthesis via a symbiotic relationship with cyanobacteria to get energy, but the water here is too cloudy. Instead many of the sponges in this reef rely on a symbiotic relationship with chemosynthetic microbes. Pretty cool!