Triggers are easy to identify by their unique oval shape, elongated snout, and often visible teeth.  Triggers are carnivores and spend most of their time grazing coral reefs or picking at invertebrates within the live rock.  Their elongated snout allows them to get to foods that are not easily reached by other fish.  Triggers require a meaty seafood diet and plenty of space to swim.  They are not reef safe and shouldn't be kept with small fish or invertebrates.