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Fish

Penguin tetra

Thayeria boehlkei
French name : Tétra pingouin

The penguin tetra is a small freshwater characin of the family Characidae, native to the Amazon basin, including parts of Peru and Brazil. It has a silvery, elongated body crossed by a distinctive bold black stripe that runs from the gill area into the lower lobe of the tail, and it often rests at a characteristic head-up, tail-down angle. It is a peaceful, active shoaling fish that must be kept in a group of at least six to feel secure and reduce fin-nipping tendencies. A planted tank with open swimming space, soft to moderately hard water and gentle flow suits it well. It is an omnivore that readily takes flake, small pellets, frozen and live foods. It is an egg-scatterer that provides no parental care and will eat its own eggs. Hardy and undemanding, it is a good schooling fish for community aquariums.

Water
Freshwater
Origin
Amazon basin, South America
Adult size
5.5 cm
Diet
Omnivore
Temperament
Peaceful
Difficulty
Beginner
Keep in group of
6+
Penguin tetra (Thayeria boehlkei)
Illustration

Water parameters

Temperature22 – 28 °C
pH6 – 7.5
Carbonate hardness (KH)1 – 12 °dKH
General hardness (GH)2 – 15 °dGH

Tank & stocking

Minimum tank volume90 L
Volume budget per individual 5 L — adds up with tank-mates
Minimum group size6 individuals (shoaling)

“Minimum tank volume” is a reasonable floor, not an absolute limit. The per-individual budget is used by the Aqua app to estimate how heavily a tank is stocked.

Frequently asked questions

What size aquarium does Penguin tetra need?

Provide at least 90 litres for a small group to keep Penguin tetra in good conditions.

What water parameters does Penguin tetra need?

A temperature of 22–28 °C, pH 6–7.5.

Is Penguin tetra peaceful or aggressive?

Its temperament is peaceful.

What does Penguin tetra eat?

Its diet: omnivore.

How many Penguin tetra should be kept together?

It is a social species: keep a group of at least 6.

How big does Penguin tetra get?

Around 5.5 cm as an adult.

Is Penguin tetra suitable for beginners?

Care level: beginner.

Planning a tank with Penguin tetra?

AquaTender turns these parameters into live advice: it checks whether your tank is big enough, how heavily it's stocked, and whether your fish are compatible — then tracks water tests, photos and maintenance for you.

➕ Add Penguin tetra to my tank Discover AquaTender
« Add to my tank » opens AquaTender — sign in (free) and pick your aquarium.

Fish from the same biotope

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