This bright green Periclimenaeus storchi shrimp lives inside a large Didemnum molle tunicate. We did a night dive at this particular site in Alor, and many of the Didemnum molle tunicates contained critters living inside of them (I saw 2 different shrimps and an amphipod). All of the critters fled from lights, and getting this picture took over half an hour of careful planning and execution. Photo by Eric Cheng, taken with Canon 7D, 100mm macro lens, Nauticam underwater housing, Light & Motion Sola 600 focus light, 2 x Ikelite DS-125 strobes.