Remarks: Perfect for a beginner or smaller tank, Harlequin Rasboras are hardy and colorful. They are similar to their cousins, the Pork Chop or Lamb Chop Rasbora (T. espei), Narrow Wedge Rasbora (T. hengeli), and Somphong's Rasbora (T. somphongsi), and the fish can be differentiated primarily by the size of the dark "wedge" (fish are listed from largest to smallest dark region).