Spotted Blue Eye Rainbow (Pseudomugil gertrudae) Care Guide:
The Spotted Blue Eye Rainbow, also known as Pseudomugil gertrudae, is a delicate and dazzling nano fish native to slow-moving, plant-rich waters of New Guinea and northern Australia. Recognized for its shimmering blue eyes, translucent body, and spotted fins, it thrives in peaceful community or species-only aquariums with gentle flow and dense vegetation. A group of six or more should be housed in at least a 10-gallon tank to encourage natural schooling and display behaviors. Ideal conditions include temperatures between 75–82°F (24–28°C), pH 6.0–7.5, and soft to moderately hard water. They are micro-predators, feeding best on baby brine shrimp, daphnia, micro pellets, and fine flake foods. Males display vibrant courtship dances, making them a lively and beautiful centerpiece for planted nano tanks.
Aspect
Details
Scientific Name
Pseudomugil gertrudae
Common Name
Spotted Blue Eye Rainbow / Gertrude’s Blue Eye
Origin
New Guinea, Northern Australia
Size
Up to 1.2 inches (3 cm)
Tank Size
Minimum 10 gallons
Temperature
75–82°F (24–28°C)
pH
6.0–7.5
Water Hardness
5–15 dGH
Diet
Micro-predator – micro pellets, fine flakes, baby brine shrimp, daphnia
Temperament
Peaceful, social, active
Tank Setup
Planted tank, gentle flow, open swimming space
Lifespan
3–4 years
Compatibility
Peaceful nano fish and shrimp