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Rainbowfish / Melanotaeniinae / Dwarf Rainbowfish

Dwarf Rainbowfish, Black-lined Rainbowfish
Melanotaenia maccullochi

Synonyms: Nematocentris maccullochi
Physical description: An elongated and laterally compressed fish with a small head and a large eye.   There are two dorsal fins, and the anal fin has a long base.  The male is silver with a blue iridescence.   The flanks are marked with seven lateral stripes.  These  are yellow becoming red near at the caudal penuncle.   The gill cover is marked with an orange-red spot.  The fins have a greenish base with blood red outer parts.   The colors of the females are less intense.  
Size/Length: To 2.8" (7 cm)
Similar species: Melanotaenia fluviatilis, M. nigrans
Habitat: Northern Australia.
S: middle, top
Aquarium: A tank measuring 28" (71 cm) with a capacity from 20-25 gallons (76-95 L) is sufficient.   Follow suggestions for M. fluviatilis.
Water chemistry: pH 7-8 (7.0), 8-15 dH (10), 68-77°F (20-25°C)
Social behavior: A peaceful schooling species recommended for a community tank.  
Suggested companions: Rainbowfish, Barbs, Danios, tetras, Gouramis, Corydoras, Livebearers
FOOD: Live; insect larvae, crustaceans, worms, insects; flakes
SEX: Males more colorful with a pointed first dorsal fins.
Breeding techniques: As for M. fluviatilis.   The parents will ignore the eggs.
Breeding potential: 5.  Breeding is easy. 
Remarks: The Dwarf Rainbow requires frequent partial water changes to fully develop its colors.
Difficulty of care: 3.  This robust fish is suitable for a community tank.


By Rhett Butler   Mongabay.com