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Ivantsoff's Blue Eye
Pseudomugil ivantsoffi
Animalia›Chordata›Actinopterygii›Atheriniformes›Pseudomugilidae
📍 Papua New Guinea
Tiny blue-eyed beauty with yellow-tipped fins. Males display spectacular fin extensions. Perfect for nano planted tanks.
Care Guide
Diet
Ivantsoff's Blue Eyes are omnivores requiring a varied diet of high-quality micro pellets, small flake foods, and regular offerings of live or frozen foods such as brine shrimp, daphnia, and micro worms. Feed small amounts once daily, only what they can consume in a few minutes, as their tiny mouths require appropriately sized food particles.
Behavior
These peaceful, schooling fish are most active during dawn and dusk, displaying characteristic darting movements through planted areas. Males exhibit spectacular fin extensions and color intensification during territorial displays, though aggression is minimal. They prefer the upper water column and thrive in groups of at least 6 individuals, becoming stressed and dull when kept singly or in pairs.
Breeding
Breeding in captivity is moderately difficult and rarely occurs in standard aquarium conditions. They are egg-scatterers that require densely planted tanks with fine-leaved plants, slightly acidic water (pH 6.5), and temperatures around 26-27°C to trigger spawning. Fry are extremely small and require infusoria or liquid fry food for the first week before accepting micro foods.
Tank Mates
Similar size, peaceful temperament, and identical water parameter requirements make them ideal companions
Small shrimp won't compete for food and add biological activity; avoid very young shrimp which may be eaten
Peaceful algae eaters that occupy different tank zones and share identical water conditions
Foreground plant that provides shelter and spawning substrate while creating the planted aesthetic they prefer
Dense plant growth offers refuge and infusoria production for fry if breeding occurs
Similar size and peaceful nature; both prefer planted tanks and soft, slightly acidic water
Common Diseases
Ich (Ichthyophthirius multifiliis)
White spots on body and fins, rapid gill movement, lethargy, rubbing against objects
Raise temperature gradually to 28-29°C, perform daily 25% water changes, use aquarium salt (1 tsp per 5 gallons) or commercial ich treatment; maintain for 10-14 days
Fin Rot
Frayed or deteriorating fin edges, discoloration at fin bases, lethargy
Improve water quality with frequent partial water changes, remove any sharp decorations, use antibacterial medication if severe; ensure temperature stays 24-26°C
Columnaris (Flexibacter columnaris)
Whitish film on body or mouth, loss of appetite, rapid breathing, isolation
Increase aeration, perform daily 50% water changes, treat with antibacterial medication; maintain temperature at 25-26°C and avoid stress
Parasitic Infections
Excessive scratching, visible parasites, clamped fins, weight loss despite feeding
Use anti-parasitic medication designed for small fish; quarantine affected individuals; maintain pristine water conditions and perform frequent water changes
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Quick Facts
- pH
- 6.5–7.5
- diet
- omnivore
- maxSize
- 1.5 inches
- minTankSize
- 10 gallons
- temperature
- 72–82°F (22–28°C)
Temperature
72–82°F
22–28°C