Neon Tetra (Paracheirodon innesi)

One quantity buys one live Neon Tetra (Paracheirodon innesi) in the size selected above. Fish are supplied unsexed because juvenile sex cannot be guaranteed. The supplier record identifies this stock as captive-bred. Neon Tetras are peaceful blue-and-red shoaling fish for mature freshwater aquariums, and they should be bought as a proper group rather than as a single display fish.

Keep at least six together, with ten or more preferred when the aquarium's footprint, filtration and total stocking allow it. Their best colour and most confident behaviour appear in stable water with planting around the edges, open midwater for swimming, gentle flow and calm tank mates. Choose the live size option in the selector for current availability; the price and stock shown there are the current authority.

Neon Tetra Quick Facts

What You Receive

This is the multi-size Neon Tetra product. Select the required dispatch size before adding fish to the basket. One quantity means one fish, not a pair, trio or pre-set shoal. Because these are small social fish, plan the complete group before ordering and check that the chosen size cannot be swallowed by established tank mates.

Size options are dispatch bands rather than exact measurements of every individual. The option marked > 3 cm states its lower boundary, while XL is a stock size label and does not carry a guaranteed centimetre measurement on this product. Natural variation is expected. Ask before ordering if an approximate current measurement is essential for compatibility with established fish.

Colour may look subdued immediately after transport. A newly arrived Neon Tetra can temporarily lose intensity while the bag is dark, the temperature changes or the fish is settling. That is not the same as a permanent colour fault. Low lighting, careful acclimation, clean water and a quiet first day normally give the group the best chance to settle naturally.

Identity, Size And Appearance

Paracheirodon innesi is a miniature South American characin in the family Acestrorhamphidae. The familiar electric-blue stripe runs from the eye towards the tail, while the red lower stripe begins around the middle of the body. Cardinal Tetras normally carry red over more of the body, which is a useful visual distinction when comparing the two species.

Fish measurements need their basis stated. FishBase records a maximum of 2.5 cm standard length, measured to the end of the body rather than the end of the tail. Aquarium descriptions often give a roughly 3-4 cm overall length because they include the caudal fin and may use rounded observations. These figures should not be presented as contradictory or combined into an artificial growth range.

The species' small adult form is real rather than simply the result of selling young fish. A peer-reviewed developmental study describes P. innesi as miniature and links its body-size reduction to accelerated development, early maturation and an early cessation of growth. The selected product option still matters at dispatch, but no Neon Tetra grows into a large community fish.

Is A Neon Tetra Right For Your Aquarium?

Neon Tetras suit peaceful planted communities where the filter is already biologically mature. Treat their overall care as moderate: feeding and routine observation are straightforward, but their small size and sensitivity to immature water demand preparation. A beginner can succeed with a fully cycled, stable aquarium; these fish are poor choices for testing an uncycled tank. Ammonia, nitrite, sudden temperature movement and repeated pH correction can affect a small shoal quickly.

They are a good choice when you want coordinated midwater movement without territorial aggression. They are not suitable when the aquarium contains predators, persistent fin nippers or fast boisterous fish that monopolise food. A single Neon Tetra is also not an appropriate substitute for a group, even if other tetra species are present.

Aquarium Size And Group Planning

FishBase's aquarium record recommends a group of five or more and a minimum aquarium length of 60 cm. For retail care, Tropical Fish Co uses six as the bare social minimum and recommends ten or more where the aquarium can support them. The 60 cm footprint is more useful than an unqualified litre number because shoaling fish need horizontal swimming room, and two aquariums with the same volume can have very different shapes.

Do not use the largest possible group number without considering the rest of the aquarium. Filtration, planted cover, adult tank mates and maintenance all matter. In a modest aquarium, one well-sized Neon Tetra shoal with a calm bottom group is usually a better plan than several species kept in token numbers.

Planted Tank Setup

Arrange plants and wood around the back and sides while leaving an open route through the middle. Fine-leaved stems, broad planting and some floating cover can soften bright light without closing the entire surface. Dark sand or fine gravel is not compulsory, but a darker base reduces glare and makes the blue lateral stripe easier to see.

Use a mature filter with a gentle, well-distributed return. Neon Tetras are not built for a constant high-velocity jet, yet they still need clean oxygenated water. Point the outlet so that debris reaches the filter without forcing the shoal to fight turbulence throughout the tank. Protect small fish from uncovered intakes with an appropriate guard or sponge.

Water Parameters And Stability

The FishBase species record places Neon Tetras in blackwater or clearwater tributaries of the Solimoes River and reports 20-26 C, pH 5.0-7.0 and 1-2 dH. Those are environmental records for the species, not a reason to make abrupt chemical changes to a captive aquarium. Captive-bred fish should be acclimated from their transport water into a stable, suitable aquarium rather than moved rapidly towards a single target number.

Test ammonia and nitrite before ordering; both should be zero. Keep nitrate controlled through stocking discipline, plant growth where appropriate and regular maintenance. If source and aquarium water differ substantially in temperature, pH or mineral content, use a gradual acclimation plan and avoid adding several sensitive groups at once.

Feeding Neon Tetras

FishBase records adults eating worms, small insects, crustaceans and plant matter. In the aquarium, use a fine complete flake or micro pellet as the dependable base and rotate suitably small frozen or live foods such as daphnia, cyclops and baby brine shrimp. Bloodworm can be included in an appropriately small form, but it does not need to be the daily staple.

Feed particles that every fish can swallow easily. Offer one or two tiny meals per day, watch the quieter fish, and stop before food reaches the substrate or filter unused. A group may rush to the surface, yet that is not a reason to add a large portion. Crushing an oversized flake is often more useful than increasing the feeding amount.

Temperament And Compatible Tank Mates

Neon Tetras are peaceful, but peaceful does not mean compatible with every fish. Choose neighbours that share a suitable temperature, do not see a small tetra as prey and allow the shoal to feed. Small rasboras, ember tetras, pencilfish, otocinclus, smaller Corydoras and kuhli loaches can work in correctly sized aquariums. A calm dwarf gourami may also work where the aquarium has enough cover and room.

Adult dwarf shrimp can coexist in many planted aquariums, but no small fish should be treated as safe with tiny shrimplets. Avoid large angelfish, predatory fish, aggressive cichlids and persistent fin nippers. Compatibility always depends on the adult size and behaviour of the individual tank mates, not just the label used in a shop.

Can Neon Tetras Live With A Betta?

Sometimes, but the individual betta matters. A calm betta may coexist with a settled Neon Tetra group in a spacious planted aquarium, while a territorial individual may chase or repeatedly stress them. Use cover and visual breaks, watch feeding and behaviour closely, and have a practical separation plan before trying the combination. A cramped bowl or very small tank is not suitable for this mix.

Neon, Cardinal, Green Neon Or Black Neon?

These names describe different fish, not colour options of one species. Neon Tetra is the familiar small blue-and-red choice for a mature peaceful community. Cardinal Tetra usually carries a longer red stripe and is commonly selected for warmer soft-water displays. Green Neon Tetra is a separate, smaller-looking species with a blue-green line. Black Neon Tetra belongs to a different genus and provides a darker horizontal contrast.

Mixing species does not create one combined shoal. If the aquarium is too small to give each species adequate numbers, choose one and build a stronger group. The Paracheirodon tetra category is the most useful place to compare closely related options.

Arrival And Acclimation

Have the aquarium fully prepared before dispatch. On arrival, inspect the unopened bag, keep lighting low and equalise temperature without leaving the fish sealed for an unnecessarily long period. Follow the current instructions supplied with the livestock and avoid adding bag water to the display where possible. If the aquarium water differs markedly from the transport water, make the transition gradually while maintaining oxygen and temperature.

After release, let the group find cover. Do not chase them for photographs or offer a heavy meal immediately. A tiny first feed can be tried once breathing and swimming look settled. Check the whole shoal over the next several days for isolation, clamped fins, white spots, unusual breathing, loss of balance or persistent refusal to feed.

Health And Common Mistakes

Healthy settled Neon Tetras hold a level posture, respond to appropriately small food and move between loose shoaling and closer grouping. Colour alone is not a diagnosis because it changes with lighting, rest, transport and stress. Persistent fading combined with isolation, rapid breathing or abnormal swimming calls for water tests and a closer health assessment.

The most common preventable problems are an immature filter, abrupt parameter changes, too few fish, unsuitable large tank mates, uncovered filter intakes and excess food. If illness is suspected, confirm water quality first and seek species-appropriate aquatic veterinary or experienced professional advice rather than treating the whole aquarium blindly.

Breeding Notes

Neon Tetras scatter eggs and do not provide parental care. Adults may eat eggs, so intentional breeding uses a separate, controlled setup with very soft clean water, subdued light, an egg-protection method and appropriately small first foods. That is specialist work and should not be expected in a normal community display.

A published incubation experiment found that 24-26 C performed best among the tested temperatures for artificial propagation and larval rearing. That result concerns eggs and larvae under experimental breeding conditions; it does not replace the broader 20-26 C species range for an adult display aquarium.

How Long Do Neon Tetras Live?

A species-specific maximum lifespan was not found in the primary papers and database records reviewed for this listing, so an exact number is not presented as a scientific fact or a guarantee. Aquarium references often describe Neon Tetras living for several years, but age at purchase, genetics, disease, water stability, diet and chronic stress all affect the outcome. Plan for a continuing care commitment rather than buying against a promised lifespan.

Prepare Before Ordering

• Confirm that ammonia and nitrite are zero and that the filter is mature.
• Check temperature with a reliable thermometer and avoid last-minute parameter changes.
• Plan at least six fish, preferably ten or more where the complete stocking plan allows.
• Choose tank mates that cannot swallow the selected dispatch size.
• Provide edge planting, open midwater and a protected filter intake.
• Have fine food ready and keep the aquarium lighting low for arrival.
• Review the selected size and live availability in the product selector before checkout.

UK Delivery And Live Arrival Guarantee

Order only when the aquarium is ready to receive the full group. Livestock dispatch depends on current stock, destination, courier operation and safe weather conditions, so the checkout and dispatch messages are the current authority rather than a permanent delivery-day promise in this description. Eligible livestock orders are covered by the Tropical Fish Co Live Arrival Guarantee, subject to the current terms and reporting steps on that page.

The current delivery policy states that each fish is bagged individually with pure oxygen and placed in an insulated polystyrene box, with a heat pack added when the weather calls for it. A tracked courier licensed to carry live animals handles the parcel, and the confirmed delivery date is sent by email. Check the live policy before ordering because routes, timing and weather safeguards can change.

Use the evidence-led care sections on this page alongside the current product selector. Options, prices and availability remain in the selector above so this description does not become stale when stock changes.

Evidence And Measurement Notes

Species identity, family, habitat, environmental water range, diet, group record, 60 cm aquarium recommendation and 2.5 cm standard-length maximum were checked against FishBase: Paracheirodon innesi. Native-range context was cross-checked with the U.S. Fish and Wildlife Service Neon Tetra screening summary.

Miniaturisation and growth wording follows the peer-reviewed developmental comparison indexed by PubMed. The breeding-temperature note is limited to the tested egg and larval context reported in the Journal of Indian Fisheries Association incubation study. Practical group and aquarium advice is identified as Tropical Fish Co husbandry guidance where it goes beyond the underlying species records.