Sea Hare
Aplysia californica

Care Level




Reef Compatible


Plant Safe


Max Size

8" - 12"

Minimum Tank Size

55 gallon


Green, Yellow, White



Water Conditions

Basic (8.2-8.5 pH), Salinity (1.02-1.025 specific gravity), High Water Hardness (10-15 dGH), 72-80 degrees Fahrenheit


General: The Sea Hare (Aplysia californica) naturally occupy rock along Californian Coast. This unique Mullusk is not calcareous, as they do not produce a calcium-based shell. Instead they feature multiple other defense mechanisms such as camouflage, intense odor, and the release of a purple ink. This Mullusk should not be introduced to an aquarium undergoing significant change in water chemistry. The addition of the Sea Hare are usually a temporary method of algae control. They can cause various issues if threatened by fish, or predatory echinoderms. It is often best to ensure the inhabitants of the aquarium will safely allow the addition of a Sea Hare.

Aquarium Diet (Herbivore): The Sea Hare (Aplysia californica) naturally consume various algal species along the rocky Californian coast. Daphnia, Spirulina, Seaweed, and algae that naturally develops within aquaria will likely satisfy this unique herbivore.

Author: Aquatics Unlimited