Harlequin Pipefish, Microphis brachyurus lineatus also known as Opossum pipefish is a very uncommon pipefish. We only find a handful or less a year. They are exceptional looking pipefish. They do require live Brine or Mysis shrimp. They are slow eaters and should only be held with seahorses, other pipefish and dwarf seahorses. We normally find them around 3 to 5 inches long.