The importance of reef structural complexity for small organisms, such as cryptobenthic reef fish (CRFs), is poorly resolved. This project's objectives are to examine how variations in reef structure affect CRF communities using underwater photogrammetry and to use aerial imagery to scale-up the resolved relationship to the area of entire reefs. This will allow us to unveil how many hidden, but critically important, fishes a reef can hold solely by mapping the reef from the air.