Pseudomugil gertrudae — Spotted Blue Eye
Family: Pseudomugilidae
Origin: Northern Australia, New Guinea, and nearby islands
Size: Up to 3.5 cm (1.4 inches)
Lifespan: 1–2 years
 
Natural Habitat
Environment: Shallow, slow-moving freshwater streams, swamps, and rainforest pools
Water Conditions: Warm, soft, tannin-rich water with heavy vegetation and detritus
Temperature Range: 22–28°C (72–82°F)
 
Physical Description
Body Shape: Slender and elongated with a slightly rounded head
Coloration:
Pale yellow to translucent golden body
Iridescent blue eyes
Black spotting on the body and fins
Fins:
Males have extended, fan-like dorsal, anal, and caudal fins
Fins marked with white, yellow, and black edges
Females are smaller with shorter, less colorful fins
 
Aquarium Care
Tank Size: Minimum 20 litres (5 gallons), best kept in groups
Water Parameters:
pH: 5.5–7.5
Hardness: Soft to moderately hard
Temperature: 22–28°C (72–82°F)
Water Flow: Gentle
Substrate: Fine sand or gravel with natural detritus
Décor: Dense plants, driftwood, floating vegetation, and shaded areas
Filtration: Gentle filtration with stable, clean water
 
Diet
Type: Omnivorous micro-predator
Preferred Foods:
Baby brine shrimp, microworms, daphnia, cyclops
Micro pellets and finely crushed flakes
Feeding Frequency: 1–2 times daily
 
Behavior & Tank Mates
Temperament:
Peaceful, schooling species that thrives in groups of 6 or more
Males display courtship behavior and fin-flaring
Compatible Tank Mates:
Other small, peaceful species (e.g., chili rasboras, pygmy corydoras, ricefish)
Ideal for nano or biotope aquariums
Behavior Notes:
Active in upper to mid-water zones; best colors in planted, low-stress setups
 
Breeding
Spawning Method: Egg scatterer
Breeding Conditions:
Spawns on fine-leaved plants or spawning mops
Eggs hatch in 7–10 days depending on temperature
Fry Care:
Feed with infusoria or liquid fry food; separate from adults for survival