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Animal care guide

Neon Tetra Care Guide

Paracheirodon innesi

A single neon tetra, or even just two or three, isn't just less colourful to watch — schooling fish kept below their minimum group size show measurably higher stress, which shortens their lifespan and dulls their colour.

Lifespan

5-8 years in a well-maintained tank (often shorter in practice)

Adult size

Roughly 2.5-4cm (1-1.5in)

Diet

Small flake or micro-pellet food, occasional live/frozen foods like brine shrimp

Temperament

Peaceful schooling fish; must be kept in groups

Housing

Minimum group of 6+; at least a 10-20 gallon established, cycled tank

Legal notes

No special permits typically required for keeping neon tetras in Canada

Neon tetras are a classic small schooling fish for freshwater aquariums, prized for their bright blue and red stripe, but they're also more sensitive to water conditions than their tiny size might suggest. Keeping them successfully comes down to two things most beginners underestimate: a properly cycled, stable tank, and a real school of six or more fish rather than just a couple.

Tank setup & group size

  • Keep neon tetras in groups of 6 or more — schooling fish kept in smaller numbers show higher stress and often duller colour
  • Provide at least a 10-20 gallon tank for a starting school, with more space and larger tanks better as group size grows
  • Fully cycle the tank (establish beneficial bacteria) before adding fish to avoid "new tank syndrome," a spike in ammonia and nitrite that is a leading cause of early tetra deaths
  • Add live or artificial plants and subdued lighting, which neon tetras generally prefer over bright, bare tanks
  • Choose calm, similarly-sized tankmates — avoid fin-nipping or overly boisterous species

Water parameters

  • Maintain water temperature around 21-26°C (70-79°F)
  • Keep pH slightly acidic to neutral, generally around 6.0-7.0
  • Aim for soft to moderately soft water; neon tetras are sensitive to hard, mineral-heavy water compared to many community fish
  • Test ammonia, nitrite, and nitrate regularly, especially in the first several weeks of a new tank
  • Perform regular partial water changes (roughly 10-25% weekly) rather than large, infrequent ones, since sudden parameter swings stress this species

Diet & feeding

  • Feed a high-quality small flake or micro-pellet food formulated for small fish, since neon tetras have tiny mouths
  • Offer occasional live or frozen foods such as baby brine shrimp or daphnia for variety and colour enhancement
  • Feed small amounts once or twice daily — only what the school can consume within a couple of minutes
  • Avoid overfeeding, which fouls water quickly in a smaller tank

Common problems

  • New tank syndrome: ammonia/nitrite spikes in uncycled tanks, a leading cause of early losses — always cycle before stocking
  • Neon tetra disease: a specific, incurable parasitic illness causing colour loss and wasting; affected fish should be isolated and, if diagnosis is confirmed, humanely euthanized to protect the rest of the school
  • Ich (white spot disease): common in stressed or newly introduced fish; treatable if caught early
  • Fin nipping or bullying: usually resolved by keeping a sufficiently large school and avoiding aggressive tankmates
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Frequently asked questions

At least 6, and more is generally better — neon tetras are a schooling species and show measurably more stress, and often duller colour, when kept in smaller numbers.

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