Food
Siganus vulpinus is omnivorous but enjoys algae and other marine plant life. From time-to-time, if hungry, it may nip at corals like Zoantharia (zoanthids and button polyps). Though not an obligate herbivore, the Foxface Rabbitfish does require algae in its diet. In captivity it can usually be coaxed into eating a combination of mysis shrimp, sheets of dried seaweed and marine flake food containing algae. It is popular with aquarists due to its appetite for feather caulerpas (Caulerpa crassifolia, C. mexicana, C. sertularoides), macroalgae that commonly overgrow the rockwork in home aquariums. S. vulpinus is highly skilled at removing this alga and will generally clear an aquarium of it within a matter of days.
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