The Polleni Grouper, Cepholopholis polleni, also known as the Harlequin Hind, Harlequin Grouper, or Harlequin Rockcod, is a rare and beautiful species of grouper. It has a fantastically colored green, yellow, and sometimes purple body with yellow tipped fins. They are aggressive eaters and should not be housed with small fish or inverts. A tank of at least 100 gallons is best to house this fish. The Polleni Grouper will eat most meaty foods.