To make sure....here is a Bryopsis pic:
Quoted from SaltwaterAquarium.com:
"Bryopsis produce chemical defenses which can be toxic to many marine animals. Therefore, herbivorous animals that naturally eat algae will often avoid this alga species. Using natural predators for control is usually preferred by most hobbyists, but finding the
right types of Hermit Crabs, Blennies,
Zebrasoma &
Ctenochaetus sp. Tangs or other animals that
might eat
Bryopsis can be a real challenge."
Only slug I have read to eat Bryopsis (none to be found for sale):
Elysia viridis
(Montagu, 1804)
Order: SACOGLOSSA
Superfamily: ELYSIOIDEA
Family: Elysiidae
DISTRIBUTION
Northeast Atlantic from Norway to the Mediterranean.
It grows to about 45mm in length and its body colour, green to bright red, is dependent on the colour of the algae it is feeding on. There are usually scattered iridescent red, blue and green spots, and there can be white patches on the parapodial edges and black markings in the head and elsewhere. Branching ducts and lobes of the digestive gland are visible through the body wall in all parts of the body.
Elysia viridis has been reported from a variety of species of alga, but it actually eats the filamentous algae
Cladophora and
Chaetomorpha as well as coenocytic algae
Codium and
Bryopsis. It is able to retain living plastids from its algal food, allowing the plastids to continue to photosynthesise within its body. The slug's colour is algal-derived, leading to the different color "morphs" which have been reported for this species.