Sea Hares can be pretty cute, I remember my LFS once got in 3 in. sea hares they were plump and had blue spots. Also how often do you have to feed them, I heard they had to be feed daily.
I am trying a lettuce sea slug and so far I believe it has eaten a lot of algae. I know they do not live very long so I am looking for a second one so the will lay eggs in my tank.