With this one beauty is in the eyes of the beholder!!! what weird weird critters!! My daughter and I are at the LFS and see this sea hare. My daughter, who happens to be 21 yrs old...thinks this thing is soooo neat. (she just finished taking a invert class at the U) According to Sprung they eat cyno bacteria and film/algae. We brought it home and it's in my refugium until I'm a little more sure of it. Oh, it's about 3" long. Hopefully it doesn't grow to 3' !! 8O