The Penguin Tetra, also known as the Hockey Stick Tetra or Penguin Fish, is a sleek and energetic schooling species prized for its unique body shape and elegant black line that runs from mid-body to the tip of its tail. This striking design gives it the nickname “Hockey Stick Fish.” Peaceful, active, and hardy, Penguin Tetras are a fantastic choice for community tanks, adding constant movement and contrast to planted aquariums. Native to the clear streams and tributaries of the Amazon Basin, the Penguin Tetra (Thayeria boehlkei) thrives in gentle-flowing, well-oxygenated waters. In the aquarium, these fish are known for their distinctive swimming posture, slightly angled upward, which, along with their black horizontal stripe, gives them their iconic “penguin-like” look. Perfect for beginner and intermediate aquarists, Penguin Tetra fish adapt easily to a variety of water parameters and tank setups. A full-grown Penguin Tetra typically reaches 2.5 inches (6 cm) in length. They feature a silvery body with a bold, jet-black line running along their sides that extends to the tail fin, giving them a clean, elegant appearance. When kept in good lighting and a dark substrate, their shimmering silver tone stands out beautifully, especially in large schools. Penguin Tetras are peaceful, social schooling fish that do best in groups of six or more. They are ideal for planted or blackline community aquariums and coexist harmoniously with species such as Neon tetras, Rasboras, Guppies, Corydoras catfish, and dwarf Gouramis. Avoid aggressive or fin-nipping fish that may disrupt their calm demeanor. A Penguin Tetra tank should have open swimming space, gentle filtration, and plants or driftwood for cover. Their rhythmic, synchronized swimming makes them a captivating sight in any aquarium. At Splashy Fish tropical fish store, our Penguin Tetra for sale and other Tetras for sale are tank-bred, grown, and sold with love and care. Visit our fish store online or aquarium in Virginia for more high-quality freshwater fish for sale. We have a lot more fish available for sale, such as betta fish for sale, aquatic plants for sale, freshwater shrimp for sale, and other aquarium supplies. What You Can Expect From Penguin Tetra Peaceful, hardy fish ideal for community aquariums Distinctive black line and “hockey stick” swimming style Grows up to 2.5 inches when mature Best kept in schools of six or more Compatible with other small, peaceful tetras types Penguin Tetra Water Parameters Tank Size: Minimum 20 gallons for a small school Temperature: 74°–82°F (23°–28°C) pH: 6.0–7.5 Hardness: 3–10 dGH Filtration: Gentle flow with clean, well-oxygenated water Penguin Tetra Care Guidelines Diet: Omnivorous. Feed a balanced diet of quality flakes, micro pellets, and frozen or live foods such as brine shrimp, bloodworms, and daphnia. Variety enhances color and vitality. Tank Setup: Provide open swimming areas and some plants or driftwood for shelter. Use subdued lighting to make their silver and black contrast stand out. Behavior: Active, peaceful swimmers that spend most of their time in the middle and upper levels of the tank. Ideal for blackline community aquariums. Visit here to explore more about How to Care for Tetra Fish. Penguin Tetra Frequently Asked Questions (FAQs) How long do Penguin Tetra live in aquarium tank? The Penguin Tetra lifespan in a well-maintained aquarium is typically 5 to 6 years, though some individuals can live up to 7 years with excellent care. To help your Penguin Tetra fish thrive long-term, maintain stable water conditions (74°–82°F), perform regular water changes, and provide a balanced omnivorous diet of flakes, micro pellets, and frozen foods. A calm, well-planted community aquarium also reduces stress and promotes longevity. How big do Penguin Tetra get? A full-grown Penguin Tetra reaches about 2 to 2.5 inches (5–6 cm) in length. Their slim, torpedo-shaped body and bold black stripe create a striking look in any tank. When kept in schools of six or more, Penguin Tetras display natural schooling behavior and vibrant silver tones that stand out beautifully in planted aquariums. Are Penguin Tetra aggressive? No, Penguin Tetras are peaceful and non-aggressive fish that make excellent additions to community aquariums. They coexist well with other calm species like neon tetras, rasboras, guppies, corydoras, and dwarf gouramis. Occasionally, males may engage in mild chasing during breeding, but it’s harmless and short-lived. Providing a spacious tank and keeping them in groups helps minimize stress and ensure stable, social behavior. { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [{ "@type": "Question", "name": "How long do Penguin Tetra live in aquarium tank?", "acceptedAnswer": { "@type": "Answer", "text": "The Penguin Tetra lifespan in a well-maintained aquarium is typically 5 to 6 years, though some individuals can live up to 7 years with excellent care. To help your Penguin Tetra fish thrive long-term, maintain stable water conditions (74°–82°F), perform regular water changes, and provide a balanced omnivorous diet of flakes, micro pellets, and frozen foods. A calm, well-planted community aquarium also reduces stress and promotes longevity." } },{ "@type": "Question", "name": "How big do Penguin Tetra get?", "acceptedAnswer": { "@type": "Answer", "text": "A full-grown Penguin Tetra reaches about 2 to 2.5 inches (5–6 cm) in length. Their slim, torpedo-shaped body and bold black stripe create a striking look in any tank. When kept in schools of six or more, Penguin Tetras display natural schooling behavior and vibrant silver tones that stand out beautifully in planted aquariums." } },{ "@type": "Question", "name": "Are Penguin Tetra aggressive?", "acceptedAnswer": { "@type": "Answer", "text": "No, Penguin Tetras are peaceful and non-aggressive fish that make excellent additions to community aquariums. They coexist well with other calm species like neon tetras, rasboras, guppies, corydoras, and dwarf gouramis. Occasionally, males may engage in mild chasing during breeding, but it’s harmless and short-lived. Providing a spacious tank and keeping them in groups helps minimize stress and ensure stable, social behavior." } }] }
