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The Penguin Tetra (Thayeria boehlkei), also known as the Blackline Penguinfish, is a powerhouse addition to any freshwater community or planted aquarium, blending high-impact aesthetics with essential utility. Featuring a sleek, silvery-gold body accented by a bold black stripe that runs horizontally and curves sharply down into the lower lobe of the tail, this active schooler is a master of the "visual geometry" era of fish keeping—serving as a natural biological indicator of a stable environment. It is a dedicated middle-to-upper water dweller, making it a functional cornerstone of a healthy freshwater ecosystem.
This hardy tetra thrives in established systems with plenty of open swimming space and moderate water flow. While generally peaceful and plant-safe, its social nature means it is best kept in schools of six or more to ensure it feels secure and displays its unique "oblique" swimming posture. To ensure long-term health, provide a varied diet of high-quality flakes, micro-pellets, and occasional treats of frozen daphnia or brine shrimp. Ensure your aquarium is well-maintained with regular water changes, as these tetras are most vibrant in clean, well-oxygenated water.
Note: Images shown are stock images and not the actual fish you will receive.
Care Level: Easy
Temperament: Peaceful
Minimum Tank Size: 20–30 Gallons
Diet: Omnivore
Plant Compatible: Yes
Max Size: 3 Inches
Water Conditions: 72 to 82°F, KH 4 to 10, pH 6.0 to 8.0
The Penguin Tetra is a strategic choice for hobbyists looking for "sophisticated contrast" and unique kinetic movement. Its specialized swimming angle and bold tail marking add a layer of depth to the upper water column that creates a distinct silhouette against surface plants or driftwood. In the context of modern aquascaping, it is widely considered an essential "accent schooler" for adding both horizontal energy and a sleek, modern profile to the display. For maximum success, provide a secure lid and stable water parameters to facilitate its natural confidence and social vitality.
We’ve dialed in the logistics for national Overnight Delivery to ensure your 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 fish from the facility to your tank with zero compromise on health or vitality.
The Penguin Tetra (Thayeria boehlkei), also known as the Blackline Penguinfish, is a powerhouse addition to any freshwater community or planted aquarium, blending high-impact aesthetics with essential utility. Featuring a sleek, silvery-gold body accented by a bold black stripe that runs horizontally and curves sharply down into the lower lobe of the tail, this active schooler is a master of the "visual geometry" era of fish keeping—serving as a natural biological indicator of a stable environment. It is a dedicated middle-to-upper water dweller, making it a functional cornerstone of a healthy freshwater ecosystem.
This hardy tetra thrives in established systems with plenty of open swimming space and moderate water flow. While generally peaceful and plant-safe, its social nature means it is best kept in schools of six or more to ensure it feels secure and displays its unique "oblique" swimming posture. To ensure long-term health, provide a varied diet of high-quality flakes, micro-pellets, and occasional treats of frozen daphnia or brine shrimp. Ensure your aquarium is well-maintained with regular water changes, as these tetras are most vibrant in clean, well-oxygenated water.
Note: Images shown are stock images and not the actual fish you will receive.
Care Level: Easy
Temperament: Peaceful
Minimum Tank Size: 20–30 Gallons
Diet: Omnivore
Plant Compatible: Yes
Max Size: 3 Inches
Water Conditions: 72 to 82°F, KH 4 to 10, pH 6.0 to 8.0
The Penguin Tetra is a strategic choice for hobbyists looking for "sophisticated contrast" and unique kinetic movement. Its specialized swimming angle and bold tail marking add a layer of depth to the upper water column that creates a distinct silhouette against surface plants or driftwood. In the context of modern aquascaping, it is widely considered an essential "accent schooler" for adding both horizontal energy and a sleek, modern profile to the display. For maximum success, provide a secure lid and stable water parameters to facilitate its natural confidence and social vitality.
We’ve dialed in the logistics for national Overnight Delivery to ensure your 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 fish from the facility to your tank with zero compromise on health or vitality.
