Chilatherina bleheri — Bleher's Rainbowfish
Family: Melanotaeniidae
Origin: Lake Holmes region, Papua New Guinea
Size: Up to 8–10 cm (3–4 inches)
Lifespan: 5–8 years
 
Natural Habitat
Environment: Clear, slow-moving rainforest streams and tributaries
Water Conditions: Soft, slightly acidic to neutral water with dense aquatic vegetation
Temperature Range: 24–28°C (75–82°F)
 
Physical Description
Body Shape: Laterally compressed, deep-bodied typical of rainbowfish
Coloration:
Males: Bright, iridescent silver-blue body with red-orange highlights on fins and flanks
Females: More subdued colors, generally silver to pale gold
Sexual Dimorphism: Males are larger, more colorful, and develop a deeper body profile
Note: Bleher’s Rainbowfish is often confused with closely related Chilatherina species. Its stunning coloration and peaceful nature make it highly sought-after.
 
Aquarium Care
Tank Size: Minimum 90 litres (24 gallons) for a group
Water Parameters:
pH: 6.5–7.5
Hardness: Soft to moderate (4–12 dGH)
Temperature: 24–28°C (75–82°F)
Water Flow: Gentle to moderate
Substrate: Sand or fine gravel
Décor: Aquatic plants, driftwood, and open swimming space
Filtration: Clean, well-oxygenated water is essential
 
Diet
Type: Omnivorous
Preferred Foods:
High-quality flakes or micro pellets
Live or frozen brine shrimp, daphnia, bloodworms
Occasional spirulina or blanched vegetables
Feeding Frequency: 1–2 times daily
 
Behavior & Tank Mates
Temperament:
Peaceful and active
Best kept in groups of 6 or more to reduce stress and promote natural behavior
Compatible Tank Mates:
Peaceful species like tetras, rasboras, Corydoras, small peaceful cichlids
Behavior Notes:
Males display more vibrant colors in the presence of other males and females
Enjoy swimming in mid to upper levels of the aquarium
 
Breeding
Spawning Method: Egg scatterer
Breeding Conditions:
Use spawning mops or fine-leaved plants
Males court females with flashing displays
Fry Care:
Eggs hatch in 7–10 days
Feed fry with infusoria or liquid fry food, followed by baby brine shrimp
 
Conservation Status
IUCN Status: Not Evaluated
Notes: A striking and peaceful rainbowfish species ideal for planted community aquariums. Consistent water quality and a group setting are key to their health and coloration