I feed with a rather large assortment of foods(most are soaked in zoe/garlic)...but specifically for my yellow tang I feed sea weed selects/nori/formulas 1&2/spirulina formula...as stated they require a leafy/green diet to keep 'em healthy & happy. In addition mine gets freahly harvested caulpera algaes from my refugium about once a week....he sees the stuff and goes nuts....tears it up right away......he must think its Mc'ds or something!!!