Pseudomugil signifer
Slim silver body with bright blue-glowing eyes and finnage edged in gold. Tolerates a wide range of hardness (some populations are brackish in the wild). Males fin-flick at each other in mock combat, all bluster, no harm.
Pacific Blue Eye (Pseudomugil signifer) reaches 3–5 cm as an adult and needs a minimum tank of 60 L. Native to Eastern Australia, it lives in the top to mid water column with a peaceful temperament. Aim for 18–28 °C, pH 6.5–8.0, and 8–25 dGH hardness. Lifespan is 2–3 years with good care. Keep pacific blue eye in groups of 8+, yes schoolers need numbers to display natural behaviour. Diet: carnivore, Micro pellet, daphnia, baby brine shrimp, crushed flake at the surface. Plant-safe: Yes. Shrimp-safe: Yes (with adults).
Care at a glance
Slim silver body with bright blue-glowing eyes and finnage edged in gold. Tolerates a wide range of hardness (some populations are brackish in the wild). Males fin-flick at each other in mock combat, all bluster, no harm.
By Mike ElmiraUpdated 1 min read
Part of our complete guide to aquarium fish for the planted tank.
The parameters that decide whether pacific blue eye fits in your tank.
Top to mid
Yes
Group of 8+
Pseudomugilidae
Carnivore
Micro pellet, daphnia, baby brine shrimp, crushed flake at the surface.
2–3 yrs
Medium
Eastern Australia
Eastern Australia
Tank-mate safety and the species this one is documented to thrive (or fail) alongside.
Direct answers to the questions search engines and AI assistants surface most often about this species.
Pacific Blue Eye (Pseudomugil signifer) needs a minimum tank of 60 L. They live in the top to mid water column and should be kept in groups of 8+, so a longer footprint matters more than depth.
Target 18–28 °C, pH 6.5–8.0, and 8–25 dGH hardness. Acclimate slowly when moving them between water sources.
Shrimp safety: Yes (with adults). Plant safety: Yes.
Pacific Blue Eye are carnivore. Micro pellet, daphnia, baby brine shrimp, crushed flake at the surface.
On Fin & Stem's 1–5 difficulty scale this species rates 2/5. Forgiving, beginner-friendly once the tank is cycled. Breeding difficulty: medium.
Typical lifespan in a well-maintained tank is 2–3 years.
A planted tank is a system. Pair this fish with one entry from each other pillar to plan the whole scape.
