Corals live in endosymbiotic relationship with dinoflagellates of the genus Symbiodinium (zooxanthallae), along with microorganisms such as bacteria, archaea, fungi, and viruses (holobiont). Corals are under pronounced threat from the well-known phenomena coral bleaching. Coral bleaching is the breakdown of symbiosis between corals and zooxanthellae as a response to stress, which is mainly associated with elevated sea surface temperatures. The role of the microbial community within the coral holobiont is not well understood, especially their role in coral bleaching. I am investigating their role in coral bleaching and assessing community differences between healthy and bleached corals.