All the nudibranch types 
will really enjoy this:
Nudibranch Behavior by David W. Behrens, with photos by Constantinos Petrinos and Carine Schrurs
From the site:
"Nudibranchs are among the most beautiful creatures on the reef, with colors and shapes that dazzle and delight. Unlike fish that may disappear before our eyes in a flash, the showy nudibranch glides slowly along the substrate, allowing us the time to savor this extraordinary sight. With their shell-less unprotected, bodies how do they survive in seas filled with hungry mouths? How do these sightless creatures navigate the reefs to find food and mates? What and how do they eat? How do they reproduce? What special relationships have they developed with other reef inhabitants? These and many more questions are answered in this informative and lavishly illustrated book. You will never look at nudibranchs the same way again."
