To celebrate 25 years supporting UK science, the NEOF Visitor Facility has worked with current visitors to create four short films that highlight their work and showcase the types of studies we support. This is the second film in the series and features Alejandro Maeda-Obregon, a visitor from University College London, working on his PhD degree in Genetics, Evolution and Environment. Alejandro is investigating the use of molecular ecology techniques to assess biological communities from endangered freshwater habitats.