I have recently added sea hares to my inventory and am using them on a few clients' aquariums with hair algae problems. Hair algae grows from having high phosphates in the aquarium. Phosphates are often created from overfeeding. The sea hare is a ferocious algae eater. A sea hare will devour an aquarium's nuisance algaes until it no longer has a food source. At this time a dedicated aquarist will transfer the animal to another home.
According to
The Monterey Bay Aquarium's Living Species List, each sea hare is both male and female, but they still need to mate. Dozens pile up for sea hare orgies. They mate in lines and circles: each is male to the one in front and female to the one behind, so each is both a mother and a father. Sea hares may lay up to eighty million eggs apiece. But most of these mother-fathers' eggs are eaten by predators.
