Pseudomugil tenellus — Delicate Blue-eye
 
Family: Pseudomugilidae
Origin: Northern Australia and southern New Guinea
Size: 4–5 cm (1.5–2 inches)
Lifespan: 2–3 years in captivity, potentially longer with optimal care
Natural Habitat
Environment: Slow-moving or still waters, such as swamps, lagoons, and coastal streams
Water Conditions: Soft to moderately hard water, slightly acidic to neutral pH
Temperature Range: 24–28°C (75–82°F)
 
Physical Description
Body Shape: Slender and elongated
Coloration: Silvery translucent body with subtle golden or bluish hues
Fins: Males have more vibrant fins with yellow, orange, or reddish edging, especially during courtship
Eyes: Striking bright blue eyes — a signature feature of the Pseudomugil genus
 
Aquarium Care
Tank Size: Minimum 20 gallons for a group
Water Parameters:
pH: 6.0–7.5
Temperature: 24–28°C (75–82°F)
Water Flow: Gentle, with clean, well-oxygenated water
Décor: Dense vegetation, driftwood, and floating plants to mimic their natural environment
Filtration: Sponge filter or other low-flow options to avoid strong currents
 
Diet
Type: Omnivorous
Preferred Foods: Live and frozen foods like daphnia, brine shrimp, and micro worms. They’ll also accept high-quality flakes or micro-pellets.
Feeding Frequency: Small meals 2–3 times daily
 
Behavior & Tank Mates
Temperament: Peaceful and social, best kept in groups of 6+
Compatible Tank Mates:
Other Pseudomugil species
Peaceful tetras, rasboras, and danios
Bottom dwellers like Corydoras catfish or small shrimp
Behavior Notes: Males display colorful fin-flaring behavior during courtship or social interactions
 
Breeding
Spawning Method: Egg scatterers, laying adhesive eggs on fine-leaved plants or spawning mops
Fry Care: Feed infusoria or powdered fry food initially, followed by baby brine shrimp as they grow
Breeding Tip: Separate adults after spawning to prevent egg predation
 
Conservation Status
IUCN Status: Not Evaluated (NE), but local populations may be affected by habitat loss and water quality changes