Microbiomes have come into focus for the study of coral reef health and disease dynamics because their health and decline are tightly coupled to their microbiome. Many coral diseases have been attributed to pathogenic bacteria, but vectors for these bacteria are still largely unstudied. The epidermis of the corallivorous bearded fireworm, Hermodice carunculata, has been shown to be a vector and reservoir for the pathogen Vibrio shiloi, causing bleaching in Oculina patagonica corals in the Mediterranean. Considering the increasing incidence and severity of coral diseases in the Caribbean, we investigated the transfer of microbes, including pathogenic and potentially probiotic taxa, with microbial ecology sequencing (16s ribosomal RNA) techniques between coral colonies and selected body parts (prostomium, pharynx, gut, whole worm samples) and feces of H. carunculata. Our results show that Vibrionaceae, a bacterial family containing known bleaching pathogens, is present in relatively high relative abundance in the whole worm samples (~30%) and the bleached great star coral, Montastrea cavernosa (~10%). We saw a similar relative abundance for the bacterial families Alteromonadaceae and Saccharospirillaceae in the fireworm’s prostomium and fire coral, Millepora sp. Our statistical analyses suggest the fireworm digestive tract (pharynx, gut, and feces) both acts as a sink for pathogenic bacteria from bleached M. cavernosa and a source to seemingly healthy M. cavernosa. These findings suggest that not only may the epidermis serve as a reservoir for pathogens, the digestive tract and pharynx in particular serve as a point of transmission between the fireworm and its healthy coral prey.