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Millennium Rainbowfish
Glossolepis pseudoincisus
Animalia›Chordata›Actinopterygii›Atheriniformes›Melanotaeniidae
📍 Lake Ifaten, Papua New Guinea
Males develop intense red-orange coloration. A hardy and peaceful rainbowfish that does well in planted community tanks.
Care Guide
Diet
Millennium Rainbowfish are omnivores that thrive on a varied diet of high-quality flake foods, micro pellets, and small frozen foods like brine shrimp and daphnia. Feed small amounts once daily, offering only what they can consume in 2-3 minutes. Supplement occasionally with vegetable matter such as blanched spinach or spirulina-based foods to support their vibrant coloration.
Behavior
These peaceful, active fish are schooling species that spend most of their time in the mid-water column, occasionally rising to the surface. Males display territorial behavior toward each other but rarely cause serious harm; they exhibit their most intense red-orange coloration during social interactions and feeding times. They are curious and responsive to tank activity, making them engaging community fish.
Breeding
Breeding Millennium Rainbowfish in captivity is moderately difficult and rarely achieved by hobbyists. They require pristine water conditions, dense vegetation for egg scattering, and a separate breeding tank to protect fry from predation. Success requires patience, as spawning is not guaranteed even with optimal conditions.
Tank Mates
Similar size, peaceful temperament, and mid-water swimming habits make them ideal companions
Peaceful bottom-dweller that won't compete for space and helps maintain tank cleanliness
Compatible schooling fish with similar water parameter preferences and peaceful nature
Nocturnal algae eater that occupies different tank zones and won't interfere with rainbowfish
Generally safe but young shrimp may be eaten; provide dense plants for shelter
Common Diseases
Ich (Ichthyophthirius multifiliis)
White spots on body and fins, rapid breathing, lethargy, flashing against objects
Raise temperature gradually to 28-29°C, perform daily 25% water changes, use aquarium salt or ich medication; treat for 7-10 days
Fin Rot
Frayed or deteriorating fins, discoloration at fin edges, lethargy
Improve water quality with frequent partial water changes, reduce stocking density, use antibacterial medication if severe
Columnaris (Flexibacter columnaris)
Whitish film on body, mouth rot, fin damage, loss of appetite
Increase water changes, maintain optimal temperature (24-26°C), use antibacterial medication; isolate affected fish if possible
Parasitic Infections
Excessive scratching, visible parasites, clamped fins, weight loss
Use anti-parasitic medication, maintain excellent water quality, quarantine new fish before adding to main tank
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Quick Facts
- pH
- 6.5–7.5
- diet
- omnivore
- maxSize
- 4 inches
- minTankSize
- 30 gallons
- temperature
- 72–79°F (22–26°C)
Temperature
72–79°F
22–26°C
Stats
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