My foxface loved
Ocean Nutrition's Seaweed Selects, especially in red or green. I attached a piece of it with one of those suction cup clips that stick to the glass of the tank. I fed that in addition to a wide variety of other foods. My foxface would finish a 2"x3" piece within three hours, and that was while feeding lots of other foods because of the other fish. I didn't have many fish, one foxface, one orchid dottyback, one coral beauty angelfish and three fairy wrasses in a 120-gal tank.
My foxface was only about 3" TL when I got him but he was a good 7" TL three years later. In my opinion, my 120-gal tank was really too small for him after he grew. I gave him to someone with a 300-gal tank.
Mine was
Signaus vulpinus but
S. vulpinus and
S. unimaculatus are very closely related. In fact, some people think they should be considered the same species. They're very nice fish. I liked mine a lot. He never caused any problems whatsoever.