Taken in ‘black out’ conditions, these images essentially show solely the diverse and often stunning fluorescent pigmentation present in a range of reef organisms. Often the appearance of a subject can be startlingly different to that viewed under normal lighting. In order to capture such imagery, it is necessary to ‘excite’ the fluorescence with a strong light source normally in the UV/deep blue spectrum. Any extraeneous blue light is flitered out by fitting the camera with a yellow filter. Although difficult to image (primarily due to focussing difficulties in low light), you can view this phenomenon in your home reef aquarium using a small UV torch. To filter out extra light use some yellow safety glasses or a film of coloured plastic.