I have forty yellow tangs (Zebrasoma flavescens), 10 Powder blue tangs (Acanthurus leucosternon), two brown tangs (Zebrasoma scopas), 13 pacific blue tangs (Paracanthurus hepatus), 4 whiteface tangs (Acanthurus japonicus), and two Red Sea Purple tangs (Zebrasoma xanthurus)...
I feed them two...