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Tetras

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Tetras for the Aquarium – Colorful Schooling Fish from South America

Tetras are among the most popular ornamental fish for freshwater aquariums. These schooling fish, most of which originate from South America, captivate with their vibrant colors, lively swimming patterns, and suitability for community aquariums. Particularly well-known species such as the neon tetra, red-headed tetra, and copper tetra have been staples of the aquarium hobby for decades.

Many tetra species are peaceful, relatively hardy, and can be successfully kept with other small to medium-sized ornamental fish. Thanks to their pronounced schooling behavior, they create a particularly harmonious effect when kept in groups.

Typical Characteristics of Tetras

Most tetras are active schooling fish that spend most of their time in the middle section of the aquarium. Their colors range from silvery sheen to intense shades of red, blue, or copper. Species with bright stripes or high-contrast markings are particularly striking.

  • Mostly peaceful schooling fish
  • ideal for community aquariums
  • often particularly colorful
  • active swimming behavior

Keeping Tetras in an Aquarium

Most tetras in an aquarium should always be kept in groups of at least 8–10 fish. Only in larger schools do they exhibit their natural behavior and appear significantly more relaxed.

Many species prefer slightly acidic to neutral water and temperatures between about 23 and 26 °C. Dense planting along the edges, combined with open swimming areas, creates optimal conditions. Floating plants or roots also help create a natural atmosphere.

Compatibility with Other Aquarium Inhabitants

Most tetras can be kept very well with other peaceful ornamental fish. Particularly well-suited examples include:

  • small to medium-sized schooling fish
  • peaceful catfish such as armored catfish or armored loaches
  • dwarf cichlids from South America

Keeping them with shrimp can work depending on the species, though very small shrimp may be eaten as fry. Snails generally do not pose a problem. However, tetras should not be kept with larger or predatory fish.

Popular Tetra Species

The tetra family includes a wide variety of different species. Among those particularly common in aquariums are:

  • Neon tetra (Paracheirodon innesi)
  • Red neon tetra (Paracheirodon axelrodi)
  • Red-headed tetra (Hemigrammus bleheri)
  • Copper tetra (Hasemania nana)
  • Glowlight tetra (Hemigrammus erythrozonus)

Depending on the species, size, colors, and care requirements vary slightly. What they all have in common, however, is their distinct schooling behavior and lively nature.

Buying Tetras – What to Look For

When buying tetras, you should always make sure to plan for sufficiently large groups. A well-structured aquarium with plants, hiding spots, and open swimming areas ensures a stress-free environment and really brings out the fish’s beautiful colors.

In our selection, you’ll find a variety of popular tetra species suitable for different aquarium sizes—from nano aquariums to large community tanks.