sharks and algae eating fish are only part the complex biological system for to understand why these reefs are so populated the team must look beyond what's visible microbiologists forest rower Katie Barrett and listed in stable study microscopic viruses and bacteria 9 as microbes good thousands have different microbes can live on Carl by taking water samples the scientists hope to determine what's living on this rations as in our own digestive system bacteria help maintain a healthy balance would but harmful microbes can sometimes turn deadly the one the team is trying to learn why sudden changes conspired