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The Blue Gudgeon Dartfish (Ptereleotris microlepis) is a powerhouse addition to any reef or marine community aquarium, blending high-impact aesthetics with essential utility. Featuring a sleek, elongated, aerodynamic silhouette, this stunning fish showcases a subtle yet mesmerizing pale blue-to-aquamarine body that shimmers with an iridescent glow under high-output reef lighting. It is a master of the "hovering dither" era of marine keeping—serving as a natural biological focal point for the mid-water column. It is a dedicated, exceptionally active schooling fish, making it a functional cornerstone of a peaceful saltwater ecosystem.
This highly active dartfish thrives in mature, established reef systems with plenty of open swimming room, a deep sandy substrate, and a dense network of rockwork crevices to dart into when startled. Unlike more aggressive family members, they are exceptionally peaceful and display their best colors and most comfortable behaviors when kept in small groups of three to six or more. To ensure long-term health, provide a premium, varied diet consisting of high-quality marine flakes, pellets, and frequent daily feedings of small, vitamin-enriched frozen foods like Mysis shrimp, brine shrimp, and cyclops. Ensure your aquarium features a secure, tight-fitting lid, as these aerodynamic swimmers are famous for jumping when spooked.
Note: Images shown are stock images and not the actual fish you will receive.
Care Level: Easy to Moderate
Temperament: Peaceful (Excellent, non-aggressive schooling fish)
Minimum Tank Size: 30 Gallons (Larger for schools)
Diet: Carnivore (Planktivore requiring multiple daily feedings)
Reef Compatible: Yes
Max Size: 4.5–5 Inches
Water Conditions: 72 to 78°F, dKH 8 to 12, pH 8.1 to 8.4, Salinity 1.020 to 1.025
The Blue Gudgeon Dartfish is a strategic choice for reef hobbyists looking for "effortless dither movement" and a shimmering, cool-toned pop of color in the open water column. Their natural shoaling instinct adds a layer of constant, fluid motion to the aquarium that beautifully complements the slow sway of soft corals and LPS. In the context of modern marine keeping, they are widely considered the ultimate "confidence fish" for calming shyer, rock-dwelling species, as their constant presence in the open water signals to other tankmates that no predators are nearby. For maximum success, utilize a fine sand bed where they can construct shared nocturnal burrows beneath the base rocks, and ensure your filtration is highly efficient to support their high-metabolism feeding routine.
We’ve dialed in the logistics for national Overnight Delivery to ensure your premium marine livestock arrives in peak condition. Every order is packed using professional-grade insulation and climate-contingent heat or ice packs, designed to maintain stable temperatures throughout the journey. We handle the technical side of the move so you can focus on the acclimation. Our protocol is built on getting these active, schooling fish from the facility to your tank with zero compromise on health or vitality.
The Blue Gudgeon Dartfish (Ptereleotris microlepis) is a powerhouse addition to any reef or marine community aquarium, blending high-impact aesthetics with essential utility. Featuring a sleek, elongated, aerodynamic silhouette, this stunning fish showcases a subtle yet mesmerizing pale blue-to-aquamarine body that shimmers with an iridescent glow under high-output reef lighting. It is a master of the "hovering dither" era of marine keeping—serving as a natural biological focal point for the mid-water column. It is a dedicated, exceptionally active schooling fish, making it a functional cornerstone of a peaceful saltwater ecosystem.
This highly active dartfish thrives in mature, established reef systems with plenty of open swimming room, a deep sandy substrate, and a dense network of rockwork crevices to dart into when startled. Unlike more aggressive family members, they are exceptionally peaceful and display their best colors and most comfortable behaviors when kept in small groups of three to six or more. To ensure long-term health, provide a premium, varied diet consisting of high-quality marine flakes, pellets, and frequent daily feedings of small, vitamin-enriched frozen foods like Mysis shrimp, brine shrimp, and cyclops. Ensure your aquarium features a secure, tight-fitting lid, as these aerodynamic swimmers are famous for jumping when spooked.
Note: Images shown are stock images and not the actual fish you will receive.
Care Level: Easy to Moderate
Temperament: Peaceful (Excellent, non-aggressive schooling fish)
Minimum Tank Size: 30 Gallons (Larger for schools)
Diet: Carnivore (Planktivore requiring multiple daily feedings)
Reef Compatible: Yes
Max Size: 4.5–5 Inches
Water Conditions: 72 to 78°F, dKH 8 to 12, pH 8.1 to 8.4, Salinity 1.020 to 1.025
The Blue Gudgeon Dartfish is a strategic choice for reef hobbyists looking for "effortless dither movement" and a shimmering, cool-toned pop of color in the open water column. Their natural shoaling instinct adds a layer of constant, fluid motion to the aquarium that beautifully complements the slow sway of soft corals and LPS. In the context of modern marine keeping, they are widely considered the ultimate "confidence fish" for calming shyer, rock-dwelling species, as their constant presence in the open water signals to other tankmates that no predators are nearby. For maximum success, utilize a fine sand bed where they can construct shared nocturnal burrows beneath the base rocks, and ensure your filtration is highly efficient to support their high-metabolism feeding routine.
We’ve dialed in the logistics for national Overnight Delivery to ensure your premium marine livestock arrives in peak condition. Every order is packed using professional-grade insulation and climate-contingent heat or ice packs, designed to maintain stable temperatures throughout the journey. We handle the technical side of the move so you can focus on the acclimation. Our protocol is built on getting these active, schooling fish from the facility to your tank with zero compromise on health or vitality.
