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The Penguin Tetra (Thayeria boehlkei) is a charming and active schooling fish, highly valued by aquarists for its distinctive appearance and lively nature. Originating from the Amazon basin, these slender tetras are easily identified by their unique swimming posture, often appearing to swim at an upward angle, giving them their characteristic 'penguin-like' gait. They possess a silvery body adorned with a prominent black stripe that extends from the gill plate, through the eye, and along the lateral line, ending in a striking black blotch on the lower lobe of the caudal fin. This stripe often has a subtle golden or iridescent sheen above it. Growing to about 2 inches (5 cm), they are peaceful and thrive in well-established planted aquariums. A minimum tank size of 20 gallons is recommended for a school of at least six individuals, as their schooling behavior is captivating to observe when kept in larger numbers. They prefer soft to moderately hard, acidic to neutral water (pH 6.0-7.5, dH 5-15) with temperatures between 72-79°F (22-26°C). An omnivorous diet of high-quality flake food, micro-pellets, and occasional live or frozen brine shrimp, daphnia, or bloodworms will ensure their vibrant health. Penguin Tetras are excellent community fish, coexisting peacefully with other similarly sized and tempered species like other tetras, rasboras, corydoras, and dwarf cichlids. They are relatively hardy and make a delightful addition to any peaceful community tank, adding movement and visual interest with their playful antics and unique swimming style.

Unique swimming angle.