title: Melanotaenia affinis
text: # Melanotaenia affinis
  
  Melanotaenia affinis, the North New Guinea rainbowfish, New Guinea rainbowfish, or red-finned rainbowfish, is a species of rainbowfish endemic to New Guinea (Western New Guinea and Papua New Guinea). It grows to 11.5 cm (4.5 in) standard length. Of the three known varieties, the so-called standard variety has the widest range. It is commonly found in the Markham, Ramu, and Sepik Rivers; their preferred habitat includes clear rainforest streams, swamps, pools, and lagoons abundant in vegetation and submerged logs.
  
  ## In the aquarium
  
  The New Guinea rainbowfish is a peaceful and adaptable rainbowfish species that grows to 14 cm. It favors a pH of 7.0, hard water: (100–150 mg/L) and a temperature of 21–28 C (70 to 82 F). It will eat small live foods and prepared diets. Just like related species, it should be kept in shoals.
  
  