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Pearl Dartfish (Ptereleotris microlepis)
The Pearl Dartfish, also known as the Pale Dartfish or Smallscale Gudgeon, is an elegant, slender species that adds a sense of graceful movement to a reef tank. While they lack the neon ”pop” of the Helfrichi Firefish, they possess a subtle, pearlescent glow that is highly attractive under aquarium lighting. In the wild, they are common throughout the Indo-Pacific, including the shallow lagoons and seaward reefs of Indonesia.
Key Information
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Common Names: Pearl Dartfish, Pale Dartfish, Smallscale Gudgeon
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Scientific Name: Ptereleotris microlepis
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Origin: Indo-Pacific (Red Sea to the Line Islands, common in Indonesia)
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Max Size: 12–14 cm (approx. 5 inches)
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Lifespan: 3–5 years
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Temperament: Very Peaceful; shy and easily startled
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Diet: Carnivore – Planktivore
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Care Level: Easy to Moderate (due to jumping risk)
Appearance & Identification
The beauty of the Pearl Dartfish is in its iridescent ”shimmer”:
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The Color: A pale, powdery blue-to-green body that appears white or silver depending on the light. It has a beautiful pearlescent sheen that ”glows” under blue LEDs.
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The Head: Features faint blue lines and dots around the eye and gill area.
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The Fins: The dorsal and anal fins are long and delicate, often carrying a very fine blue or dark trim.
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Body Shape: Extremely slender and ”torpedo-shaped,” built for sudden bursts of speed.
Behaviour & Tank Compatibility
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The ”Darting” Habit: True to their name, they spend much of their time hovering in the mid-water column, ”darting” forward to catch tiny pieces of food and then retreating into a hole if they sense danger.
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Reef Safe: 100% Reef Safe. They are completely harmless to corals, clams, and even the smallest ornamental shrimp.
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Social Structure: Unlike many firefish, Pearl Dartfish are very social. They are much more confident when kept in groups of 3 or more. They will often share the same burrow or bolt-hole.
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Tank Mates: Must be kept with peaceful companions. They are easily bullied by aggressive damsels or large, boisterous wrasses. Excellent with Anthias, Cardinalfish, and peaceful Gobies.
Ideal Tank Setup
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Tank Size: A minimum of 115L (30 Gallons) for a group.
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Lid is Mandatory: This is the most important rule for dartfish. They are notorious jumpers. If startled (even by the lights turning on), they will bolt upward. A tight-fitting mesh or glass lid is essential.
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Rockwork: Provide a sand bed and rockwork with specific ”bolt-holes”. They like to have a designated cave or crevice where the entire group can vanish simultaneously.
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Water Flow: They prefer moderate flow. They enjoy swimming against a steady current in the middle of the tank.
Dietary Needs
They have high metabolisms and need to eat small amounts frequently:
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Feeding Frequency: Feed 2–3 times daily.
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Preferred Foods: Small frozen meaty foods like mysis, enriched brine shrimp, Calanus, and copepods.
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Dry Foods: Once acclimated, they will usually accept high-quality marine flakes and tiny pellets.
Why Choose the Pearl Dartfish?
The Pearl Dartfish is for the hobbyist who wants a peaceful, schooling fish that brings a tranquil ”drift” to the aquarium. While a single fish might be shy, a small group of 5 or 6 creates a beautiful, shimmering effect in the water column. They are a fantastic, budget-friendly alternative to more expensive dartfish and are a perfect fit for a peaceful Indonesian-themed reef.
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