This is a leafy sea dragon, and to me it’s one of the most intriguing creatures on the planet. They are found off the coasts of Australia, although I photographed this one in the Georgia Aquarium in Atlanta. To prevent unwanted reflections in the Plexiglas, I placed my lens up against the side of the aquarium with a rubber lens hood between the rim of the lens and the surface of the Plexiglas. When shooting through a material like this -- less-than-optically-superior glass or plastic -- it’s important to angle the lens axis perpendicular to the side of the aquarium. If it is oblique, even a little, image quality degrades significantly. I used a 50mm macro for this picture, and the settings were 1/125, f/7.1, 800 ISO. I used a flash because the ambient illumination was so dim.