Penguin Tetra tank mates
Thayeria boehlkei
5 rated pairings from the Penguin Tetra care guide. Compatibility here means water, temperament, tank zone and adult size all line up — the note on each card says why. Penguin Tetra needs at least 20 gallons on its own; every companion adds to that.
Excellent matches
2 · Same water, complementary zones, no conflict.
Neon Tetra
Paracheirodon innesi
10 gal min · 1.5" adult · Peaceful
Similar size, water requirements, and peaceful temperament; excellent community fish
Cardinal Tetra
Paracheirodon axelrodi
15 gal min · 2" adult · Peaceful
Comparable size and habitat needs; both thrive in soft, slightly acidic water
Good matches
3 · Compatible with normal care — watch space and numbers.
Otocinclus
Otocinclus vittatus
10 gal min · 1.5" adult · Peaceful
Small, peaceful algae eaters that won't compete with tetras and prefer similar conditions
Red Cherry Shrimp
Neocaridina davidi
5 gal min · 1.2" adult · Peaceful
Peaceful invertebrates that occupy different niches; ensure adequate vegetation for shrimp safety
Dwarf Gourami
Trichogaster lalius
15 gal min · 3.5" adult · Semi-aggressive
Peaceful, slow-moving fish that won't outcompete tetras; compatible water parameters
Also recommended alongside Penguin Tetra
Species whose own guides list Penguin Tetra as a tank mate.
Planning this tank?
Run the whole stock list through the calculator — it checks bioload and schooling numbers, not just pairings.