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Cardinal Tetras (Paracheirodon axelrodi)

Cardinal Tetras (Paracheirodon axelrodi)

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Freshwater Fish

Cardinal Tetra

The more vivid, full-length cousin of the Neon Tetra -- the blue stripe and red underside run the entire length of the body, producing a more dramatic and more complete colour display in every individual.

Full-Length Blue & Red Stripe Paracheirodon axelrodi Peaceful Schooling Fish pH 4.5–7.0 Soft Acidic Water Caridina Compatible

Cardinal Tetras (Paracheirodon axelrodi) are closely related to the Neon Tetra but display a more complete and more vivid colour pattern -- the iridescent blue stripe runs the full length of the body from head to tail, and the vivid red underside covers the entire lower half of the fish rather than only the rear portion as in Neon Tetras. The result is a bolder, more saturated, and more symmetrical colour display that many hobbyists consider superior to the Neon Tetra for planted tank display. Native to the blackwater tributaries of the Rio Negro and Orinoco in South America, Cardinal Tetras prefer soft, acidic water that aligns closely with Caridina shrimp parameters, making them one of the most natural fish companions for a Caridina planted tank. They are peaceful, schooling fish requiring groups of 10 or more, and their colour is most vivid in soft, warm, tannin-stained water with subdued lighting.

4.5–7.0pH
1–8GH (dGH)
73–81°FTemperature
2 inMax Size

Full-Length Stripe and the Cardinal Advantage

The blue stripe and red underside run the full length of the body -- the key distinction from the Neon Tetra. In a Neon Tetra the red colouration begins at the middle of the body and covers only the rear half. In the Cardinal Tetra the vivid red extends from the chin to the base of the tail, covering the entire lower half of the fish. The blue iridescent stripe similarly runs the complete length from the eye to the tail. This gives every individual a more complete and more dramatic colour display -- the full-body coverage means the fish reads as vivid at any angle rather than only from the rear. Colour is most vivid in soft acidic water with tannins and subdued lighting. Cardinal Tetras originate from blackwater environments stained with tannins from decaying leaf litter. In water that replicates these conditions -- soft, acidic, warm, with some tannin presence from Almond Leaves or driftwood -- the iridescent blue stripe achieves its greatest intensity and the red underside its deepest saturation. In bright, hard, alkaline water the colour fades noticeably and the fish show more stress. School of 10 minimum, 15 or more strongly recommended. Cardinal Tetras are obligate schooling fish and show colour loss, hiding, and stress in small groups. In a school of 15 or more they swim in tight formation and the collective shimmer of blue and red moving through planted greenery is one of the most impressive displays achievable in a freshwater aquarium. Larger schools also produce tighter, more synchronised schooling behaviour that adds visual dynamism the fish cannot produce alone. Slightly larger and somewhat more temperature-sensitive than Neon Tetras. Cardinal Tetras reach approximately 2 inches at maturity, slightly larger than Neon Tetras. They prefer warmer water at 76 to 81°F and are less tolerant of the cooler end of the temperature range than Neon Tetras. They do not thrive at the cool temperatures preferred by White Cloud Mountain Minnows or Peppered Cories.

Natural Partner for Caridina Tanks

Parameter overlap with Caridina shrimp is near-perfect -- one of the best fish pairings for a Caridina planted tank. Cardinal Tetras prefer pH 4.5 to 7.0 and very soft water, which aligns closely with the Caridina parameter range of pH 5.8 to 6.8 and GH 4 to 6. A well-established Caridina tank running RO water with active substrate and a temperature of 74 to 78°F is simultaneously close to ideal for a school of Cardinal Tetras. No parameter compromise is required between the two species. Adult Caridina and Neocaridina shrimp are safe -- shrimplets are at moderate risk. Cardinal Tetras are mid-water to upper-water swimmers and are not aggressive substrate hunters. Adult shrimp at full size are too large to be targeted. Shrimplets in their first week are small enough to be consumed if encountered in open water. Dense planting with Java Moss, Subwassertang, and fine-leaved plants gives shrimplets the cover needed to survive to adulthood in a mixed tank. The visual combination of Cardinal Tetras and Crystal Red or Crystal Black Shrimp is one of the most striking in the hobby. The vivid blue-and-red of the Cardinals moving through the mid-water above a colony of patterned CRS or CBS on dark substrate, in tannin-stained water with green planting, is a complete and intentional display that each species contributes to equally. The colour relationships between the species -- the red of the fish echoing the red of the CRS, the blue stripe counterpointing the white banding -- read as genuinely complementary. Not ideal for hard-water Neocaridina setups at pH above 7.2. Cardinal Tetras can survive in neutral water but their colour fades and lifespan shortens in hard or alkaline conditions. For standard hard-water Neocaridina tanks, Neon Tetras or Celestial Pearl Danios are better-suited alternatives.
Keeper's Note

A school of 15 Cardinal Tetras in a blackwater-style Caridina planted tank with Almond Leaves, dark substrate, low flow, and subdued lighting is one of the most visually complete freshwater aquarium setups achievable at the hobbyist level. The tannin-stained water deepens the iridescent blue of the Cardinals to its most vivid expression, the Crystal Red Shrimp below are visible and active against the dark background, and the overall aesthetic -- warm, naturalistic, rich -- holds together as a unified display rather than a collection of individual elements. It takes patience to establish but is one of the most rewarding setups in the hobby once stable.

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What to expect from your fish, overnight shipping requirements, and what to do when your order arrives.

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Choose overnight (next day air) shipping for fish. Our Live Arrival Guarantee does not cover fish shipped by 2-day, standard expedited or ground service. Overnight shipping is a condition of coverage; the claim deadline and documentation requirements below also apply.

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Fish size and appearance vary by species, age and individual. Refer to the listing and selected option for any stated purchase size. Adult or maximum sizes in care information describe growth potential, not a guaranteed size on arrival. Photos represent the species or variety rather than the exact fish you will receive.

Color & settling in

Color and markings can vary between individuals and with age, sex, lighting and aquarium conditions. Fish may look paler after shipping. Follow the species-specific acclimation and care guidance and provide stable water conditions. If a fish arrives dead or visibly distressed, document its condition and contact us promptly rather than waiting beyond the claim window.

Species needs & compatibility

Check the specific listing for adult size, temperature, water requirements, diet and recommended group size. A small shipping size does not mean a fish will stay small. Choose suitable tankmates and allow for adult growth; a community-fish label is not a guarantee of compatibility with every fish or invertebrate.

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The selected quantity identifies the number of fish ordered. A group does not by itself promise a breeding pair or particular sex ratio. Any explicit sex or selection offered in the listing applies to that selected option.

Juvenile appearance, growth & sex differences

Young fish may have less intense coloration, different proportions or less-developed fins than mature examples in photographs. Species, age, sex and social conditions can affect their appearance. Adult-size figures describe growth potential, not the size guaranteed in the shipping bag.

Plan housing around adult needs. A small pleco, for example, still needs the space and diet appropriate to its identified species as it grows. Use the listing’s stated species and selected option rather than a photograph alone to judge what you are buying.

Unless a listing explicitly offers a sex-selected option, a quantity pack is not a specified sex ratio or breeding pair. Where an explicit selection is offered, that selected option applies.

Shipping appearance versus concerning distress

Paler colors, hiding and a reduced initial appetite can occur after transport. These observations alone do not establish a covered loss. They also should not be used to dismiss a fish that appears to be struggling.

Photograph or record visible concerns such as loss of balance, persistent labored breathing, an obvious wound or a fish that appears dead while it is still in the original packaging. Include the label and packaging and contact us promptly within the two-hour reporting window. Report observations rather than guessing a diagnosis.

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Schools, tankmates & adult housing

Schooling fish should be housed with an appropriate group of their own species. The quantity options offered for purchase are not a statement that each option is a suitable permanent school size. Check the listing’s group-size guidance and the aquarium’s capacity.

Peaceful fish can still eat animals small enough to fit in their mouths, including shrimplets. Consider adult size, feeding behavior, water requirements and available shelter when choosing tankmates. No general community label guarantees compatibility in every aquarium.

Bottom-dwelling fish need food that reaches them; they should not be expected to live only on leftovers. Provide the species-appropriate diet and observe whether quieter fish are being outcompeted.

Acclimation & quarantine

Have a stable, cycled aquarium or suitable quarantine setup ready before the shipment arrives. Follow the acclimation instructions appropriate to shipped fish and the species; do not assume a single timed method is suitable for every shipment or bag condition.

Document arrival concerns before transfer under the guarantee’s instructions. Avoid adding shipping water to the established aquarium, and minimize unnecessary handling and disturbance during introduction.

Separate observation of new fish can help protect an established collection and make feeding and behavior easier to monitor. Quarantine is care advice here, not a newly added condition of claim eligibility. Do not medicate automatically without considering the species and the actual concern.

Bonus animals & your paid count

When inventory allows, our policy provides one bonus animal for every five ordered of the same species. Bonuses are discretionary and are not separately covered for refund or replacement. They count toward the total arriving alive when assessing whether your paid quantity was fulfilled.

For example, if you order 10 fish and receive 12, receiving 11 alive fulfills the paid count. If fewer than 10 arrive alive, the shortfall is assessed under the guarantee. Expected bonuses that were not included are not a paid-item shortage.

Checking quantities & reporting a short count

Check the actual animals received against your paid order quantity. For a suspected short count, the full policy calls for a clear counting photo showing all animals, the empty bag and the shipping label before they are introduced into an aquarium. Follow its counting instructions and contact us if you cannot document the count clearly.

Verified miscount claims are resolved with a refund for the missing paid animals under the current policy. A count made after release can be unreliable when animals hide among plants or hardscape.

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The guarantee contains restrictions on opening bags, acclimation and transfers. Review those instructions before taking action so the evidence needed to assess the claim is preserved.

Arrival problem? Document it promptly.

Email support@superiorshrimpaquatics.com within two hours of the carrier’s recorded delivery time, using the email address on your order.

  • Photograph the original sealed bag with the animals visible and countable.
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  • Document any bag damage or leakage before opening.
  • Report all arrival losses in your initial message.

Read the full guarantee for photo requirements, cloudy-water documentation and claim eligibility before opening or transferring animals. Approved claims are resolved under the options and conditions stated there.

Shipping & coverage limits

Fish must ship by overnight (next day air) service to qualify for the Live Arrival Guarantee. Fish shipped by 2-day, standard expedited or ground service are not covered. Selecting a non-overnight method waives guarantee coverage for the fish in that order.

The guarantee applies to the first delivery attempt. Redirection, pickup holds and carrier delays can affect eligibility under the full policy. Any product-specific coverage restrictions stated in a listing also apply.

Hitchhikers & quarantine

Live aquatic products can carry tiny hitchhikers or eggs despite inspection. Pest-free arrival is not guaranteed. We recommend quarantining new arrivals before introducing them into an established aquarium.

Returns

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