One of the most iconic freshwater fish in the hobby, famous for its striking iridescent blue and red stripes. Originally from the blackwater streams of the Amazon basin, they prefer slightly cooler water than many tropical fish and must be kept in schools to thrive, display natural behaviors, and feel secure.
Neon Tetra At a Glance
Neon Tetra Tank Requirements
Will Neon Tetra fit in your tank?
Care guides tell you what Neon Tetra needs, the next question is whether your tank can safely provide it. Test Neon Tetra against your tank size, maintenance needs, and the fish you already keep before you buy.
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Neon Tetra Water Parameters
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Neon Tetra Temperament & Compatibility
Neon Tetra Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Standard
The classic wild-type coloration with a bright blue back line and a red stripe running from the middle of the body to the tail.
Same care requirements as the base species
Also known as: Regular, Wild Type, Blue, Red
Long Finned
A selectively bred variety with elongated, flowing fins. Requires gentler water flow to prevent exhaustion and is more susceptible to fin-nipping tank mates.
Differs in 2 traits from base species
Also known as: Veiltail, Longfin
Albino / Gold
Color morphs that lack dark pigmentation, giving them a golden, white, or pale pinkish body while retaining the reflective stripe.
Same care requirements as the base species
Also known as: Albino, Gold, Diamond Head, Lutino
Neon Tetra Care Guide Summary
The Neon Tetra, scientifically known as Paracheirodon innesi, belongs to the Characins family group. Adults reach a maximum size of approximately 4 cm and have a fusiform body shape with a moderate growth rate. Classified as peaceful, this species primarily occupies the mid-level zone of the aquarium and produces a low level of biological waste.
To thrive, the Neon Tetra requires a freshwater only aquarium with a minimum volume of 38 litres and a tank length of at least 45 cm. Water temperature should be maintained between 20°C and 26°C, with a pH range of 5–7.5 and a general hardness of 1–10 dGH. A moderate water flow is preferred.
Due to its specialist needs, the Neon Tetra is best suited for fishkeepers who can provide a carefully planned setup. This species is available in 3 varieties: Standard, Long Finned, and Albino / Gold. Each may differ slightly in size, temperament, or care needs, so it is worth checking the specific requirements of the variety you plan to keep.
Neon Tetra Habitat Setup
When setting up an aquarium for the Neon Tetra, a moderate water flow best suits their natural preferences. Because this species occupies the mid-level zone, the aquarium layout should prioritise open swimming space in the centre of the tank for free movement. Useful additions include leaf litter or blackwater tannins to replicate their natural soft-water habitat, dense planting to provide cover, break sightlines, and reduce stress, and floating plants to diffuse overhead light and create shaded areas.
Neon Tetra Compatibility Notes
Classified as peaceful, the Neon Tetra is a schooling species that feels most secure in a sizeable group, where natural shoaling behaviour reduces stress and brings out their best colours. When choosing tankmates, their energetic swimming style may stress more sedentary or timid species. Selecting tankmates that favour different water layers from the mid-level zone can help reduce competition and territorial overlap.
Neon Tetra Recommended Tank Sizes
Standard aquarium sizes that meet the minimum volume and length requirements for Neon Tetra.
10 Gallon Standard
15 Gallon Standard
20 Gallon High
20 Gallon Long
29 Gallon Standard
30 Gallon Breeder
Show 22 more tank sizes
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Frequently Asked Questions About Neon Tetra
How big does Neon Tetra get?
Neon Tetra (Paracheirodon innesi) typically reaches a maximum adult size of approximately 4 cm. They have a fusiform body shape and a moderate growth rate.
What tank size does Neon Tetra need?
A minimum aquarium volume of 38 litres and a tank length of at least 45 cm are recommended for Neon Tetra. This ensures enough swimming space and helps maintain stable water conditions.
What water parameters does Neon Tetra need?
Neon Tetra thrives in freshwater only conditions with a temperature range of 20–26°C, a pH between 5 and 7.5, and a general hardness of 1–10 dGH. A moderate water flow is preferred.
Is Neon Tetra peaceful or aggressive?
Neon Tetra is classified as peaceful with an aggression score of 1 out of 10. They are generally well-suited to peaceful community tanks.
How many Neon Tetra should be kept together?
Neon Tetra is a schooling species and should be kept in groups of at least 6. Larger groups help distribute aggression and encourage natural schooling behaviour.
Does Neon Tetra have any special tank requirements?
Yes. Neon Tetra benefits from plants - densely covered, leaf litter/blackwater, and plants - floating in the aquarium. These features help replicate their natural habitat and promote overall health and well-being.
Top Tank Mates for Neon Tetra
These fish are strong compatibility matches for Neon Tetra based on water preferences, temperament, adult size, and tank behavior.
Hillstream Loach
Beaufortia leveretti
Ideal Tank MatesSchwartz's Cory
Corydoras schwartzi
Ideal Tank MatesLeopard Cory
Corydoras leopardus
Ideal Tank MatesHi Fin Peppered Cory
Scleromystax macropterus
Ideal Tank MatesGold Laser Cory
Corydoras sp. 'CW010'
Ideal Tank MatesDainty Cory (Salt and Pepper Cory)
Corydoras habrosus
Ideal Tank MatesPlants That Suit Neon Tetra
These plants pair well with Neon Tetra based on shared water preferences, layout fit, and how likely they are to hold up in the same aquarium.
Afzel's Anubias
Anubias afzelii
Amazon Sword
Echinodorus amazonicus
Anacharis
Egeria densa
Anubias Barteri
Anubias barteri
Baby Tears
Lindernia rotundifolia
Balansae
Cryptocoryne crispatula
Fish Similar to Neon Tetra
Green Neon Tetra
Paracheirodon simulans
A striking, nano-sized schooling fish native to the blackwater habitats of the upper Rio Negro and Orinoco basins. Distinct from standard Neon Tetras, the Green Neon has a dominant, brilliant blue-green iridescent stripe running the entire length of its body, with little to no red pigmentation. They are extremely peaceful, somewhat timid, and require soft, acidic water with subdued lighting to thrive.
Black Neon Tetra
Hyphessobrycon herbertaxelrodi
A peaceful, active schooling fish native to the Paraguay basin. Known for its striking contrast of a dark black lateral stripe underneath a glowing iridescent white/green-gold stripe. Excellent for community aquariums, particularly in planted setups or blackwater biotope tanks with subdued lighting.
Glowlight Tetra
Hemigrammus erythrozonus
A peaceful, schooling nano fish native to the Essequibo River basin in South America. They are famous for their translucent bodies and the striking iridescent neon-orange stripe running from snout to tail. They thrive in mature, planted aquariums with slightly soft, acidic water and subdued lighting.
Cardinal Tetra
Paracheirodon axelrodi
A stunning schooling fish native to the upper Orinoco and Rio Negro basins in South America. Famous for its brilliant iridescent blue line and a vivid red stripe that extends the full length of its body (distinguishing it from the Neon Tetra). They are strictly schooling fish that thrive in warm, acidic blackwater environments.
Flag Tetra
Hyphessobrycon heterorhabdus
A peaceful, active schooling fish native to the Amazon basin. It is commonly called the 'Belgian Flag Tetra' due to the distinctive tricolor lateral stripe (black, red, and yellowish-white) running along its side. They are an excellent community fish that thrives in planted aquariums with soft, slightly acidic water. Like most tetras, they must be kept in groups to feel secure and display their best colors.
Blue Emperor Tetra
Inpaichthys kerri
The Blue Emperor Tetra, also known as the Royal Tetra, is a stunning, active schooling fish native to the Aripuanã River basin in Brazil. They feature a bold dark lateral stripe and vibrant blue-purple iridescence that intensifies in planted aquariums with slightly acidic water. Males will actively spar and display to establish dominance, but are harmless to other species.