−15%
Moderate
Cardinal Tetra (Paracheirodon axelrodi)
23–27°C · pH 4.5–7 · 60L
£2.54£2.99
Diamond Neon Tetra is a peaceful Paracheirodon innesi colour form for mature planted community aquariums and settled schooling groups.
Adult size is the maximum length this species reaches at full maturity (scientific sources). The livestock you receive will be younger and smaller — pick a size variant above for the actual shipping size. Photos are AI-enhanced, so the animal may show subtle colour or marking differences.
Paracheirodon innesi
Diamond Neon Tetra are a shoaling species — they need 6+ to feel safe and show their full colour.
Diamond Neon Tetra is a peaceful Paracheirodon innesi colour form for mature planted community aquariums and settled schooling groups.
Adult size is the maximum length this species reaches at full maturity (scientific sources). The livestock you receive will be younger and smaller — pick a size variant above for the actual shipping size. Photos are AI-enhanced, so the animal may show subtle colour or marking differences.
Add vivid blue and red colour to your aquarium with Neon Tetra. Peaceful shoaling tropical fish ideal for community tanks. Order now for UK delivery.
Maintain these water conditions for optimal health and vibrant colors
Diamond Neon Tetra (Paracheirodon innesi) is a bright captive form of the classic Neon Tetra, selected for the extra reflective shimmer across the head and upper body. It is sometimes sold as Diamond Head Neon Tetra, Blue Diamond Neon Tetra or Neon Tetra Diamond, but the species behind the trade name remains Paracheirodon innesi. That distinction matters: the word diamond describes the colour form, not a separate scientific species.
This is a small, peaceful, schooling tetra for mature planted community aquariums. The blue lateral stripe, red lower body and sparkling head sheen show best in a calm group over dark substrate, fine plants, leaf litter, roots or shaded wood. Keep it as a proper shoal rather than a single display fish; the colour, confidence and movement are much better when the group can settle together.
| Scientific name | Paracheirodon innesi |
|---|---|
| Trade form | Diamond Neon Tetra, Diamond Head Neon Tetra, Neon Tetra Diamond |
| Adult size | About 3-4 cm in aquarium conditions |
| Minimum aquarium | 40 litres for a small settled group; 60 cm or larger is better for natural schooling |
| Temperature | 20-26 C, with stable water more important than chasing extremes |
| pH | 5.0-7.5; soft, slightly acidic to neutral water is ideal |
| Temperament | Peaceful, active, mid-water schooling tetra |
| Diet | Fine flake, micro pellets, frozen cyclops, daphnia, baby brine shrimp and other small foods |
| Best kept as | Six or more, with ten or more strongly preferred |
The supplier line for this fish uses the wording Paracheirodon / innesi diamant. In customer-facing copy we treat that correctly as a diamond trade form of Paracheirodon innesi, not as a made-up species name. This keeps the listing clearer for customers, cleaner for Google, and more useful for AI systems that compare product identity against accepted taxonomy.
The diamond form keeps the familiar neon body plan: a slim body, an electric blue stripe, a red lower stripe from the rear half of the body into the tail, and a reflective area around the head and upper flank. The exact brightness can vary with age, mood, lighting and the individual fish. The source photograph and the existing gallery images all show the correct Neon Tetra shape and red-blue pattern.
Use a cycled, stable aquarium with gentle flow and plenty of plant cover. Fine-leaved plants, floating plants, wood, botanicals and shaded corners help the school feel secure. A dark background or dark substrate makes the blue and red colour stand out without forcing harsh lighting.
Although Neon Tetras are often recommended to newer fishkeepers, they do best in a tank that has already settled biologically. Avoid adding them to a brand-new aquarium with unstable ammonia, nitrite, temperature or pH. They are small fish with a low body mass, so sudden swings affect them quickly.
For a compact community tank, keep open swimming space through the middle and plant the back and sides. In larger planted aquariums, the group will often move as a loose school, tightening up when startled and relaxing again when the tank is calm.
FishBase lists Paracheirodon innesi from blackwater and clearwater tributaries, with soft acidic water and tropical temperatures. Petra's supplier data for this batch gives pH 5.0-7.0, temperature 20-27 C and hardness 0-15 dGH. In practice, aim for clean, stable water in the middle of that range rather than frequent adjustment.
Good routine care matters more than additives. Keep nitrate controlled, avoid sudden cold-water changes, and acclimate slowly on arrival. If your tap water is hard or alkaline, choose tank mates that tolerate the same conditions and keep the aquarium especially stable.
Diamond Neon Tetras are small omnivores and micropredators. Offer fine flakes or micro pellets as the base diet, then rotate small frozen or live foods such as cyclops, daphnia, baby brine shrimp and finely chopped bloodworm. Food should be small enough to swallow easily; large pellets and chunky frozen foods are often ignored or mouthed and dropped.
Feed small portions once or twice daily. A settled group should come forward quickly, feed in mid water and keep a rounded but not swollen body shape. Remove leftovers before they spoil the water, especially in smaller aquariums.
This is a peaceful schooling fish, not a territorial feature fish. A lone Neon Tetra often looks nervous, fades in colour and hides. Six is the practical minimum, while ten or more gives a much better display and spreads attention within the group. Because this product has two size options, choose the size that best matches the existing fish in your aquarium.
Expect calm mid-water movement rather than constant tight schooling. Healthy Neon Tetras often browse, pause, regroup and then move together when the tank is approached. Very pale colour, clamped fins, isolation or gasping are warning signs to check water quality and tank-mate behaviour.
Choose small, peaceful community fish that will not chase, nip or swallow them. Good matches include other peaceful tetras, small rasboras, small Corydoras, Otocinclus, peaceful dwarf cichlids in suitable setups, and gentle livebearers that share similar water needs. Avoid large cichlids, predatory fish, boisterous barbs, fin nippers and anything with a mouth large enough to treat a Neon Tetra as food.
Adult dwarf shrimp can work in heavily planted aquariums, but tiny shrimp fry may be eaten. If shrimp breeding is the main goal, a shrimp-only aquarium is safer.
Diamond Neon Tetras stay compact and show a red stripe mainly through the rear half of the body. Cardinal Tetras usually show a longer red stripe and tend to prefer warmer, softer conditions. If you want a cooler, compact planted-community shoal with extra head sparkle, the Diamond Neon is the better match. If you are building a warmer blackwater-style display, Cardinal Tetras may be worth comparing.
Livestock orders are packed carefully and sent by UK live-fish courier. The Live Arrival Guarantee applies when the delivery and acclimation instructions are followed. Use a dim room, float the sealed bag to equalise temperature, then acclimate gradually before release. Do not pour transport water into the aquarium.
Because both live Shopify variants currently read back in stock, this listing can also mention the first-order code WELCOME10 naturally. Use it only if it appears during checkout and always prioritise healthy group size over buying too few fish.
The gallery includes existing AI-assisted aquarium views plus the exact Petra/source photo for this SKU as an additional reference image. No existing image has been removed. The supplier photo is useful for checking the body shape and red-blue Neon Tetra pattern; the planted images show how the fish can look in an aquascaped display.
This listing was checked against Petra supplier data, FishBase for Paracheirodon innesi, Seriously Fish husbandry notes, Practical Fishkeeping's Paracheirodon overview, and current trade references for Diamond or Blue Diamond Neon Tetra forms. The result is intentionally natural: strong Neon Tetra and Diamond Neon Tetra wording, but without forced phrases or fake scientific names.
Neon Tetras can look pale after transport, during early morning lights-on, or while they are still learning the layout of a new aquarium. Colour should improve once the group has rested, found cover and begun feeding. Keep the lights subdued on arrival day and avoid chasing them around the tank with a net after release.
The main long-term health rule is stability. Keep ammonia and nitrite at zero, avoid sudden temperature drops, and keep up with small regular water changes. Quarantine is sensible if adding them to a tank with established delicate fish, because small schooling tetras can carry stress from transport even when they look bright in the bag.
Watch for white spots, clamped fins, rapid breathing, ragged fins or a fish leaving the group. Those signs do not automatically mean the whole shoal is failing, but they are a reason to test water immediately and check that no tank mate is bullying the group. Clean water, quiet surroundings and correct food size solve many early settling problems before they become serious.
Breeding Paracheirodon innesi is possible, but it is not a simple community-tank project. Eggs and fry are tiny, adults may eat eggs, and the best results usually need a separate dimly lit breeding tank with very soft, clean water. For most customers, the sensible goal is a healthy display shoal rather than breeding.
If you do want to try breeding, condition adults with small live and frozen foods, use fine spawning mops or moss, remove adults after spawning, and keep the first foods extremely small. This section is included for completeness, but it should not distract from the everyday care priority: a settled, well-fed group in stable planted water.
The product is sold in size options because Petra supplies both standard and XL fish. If you already have small Neon Tetras, the standard 2.5-3 cm size usually blends in more naturally. If you want a stronger instant display or need fish closer to mature size, the XL option may be the better fit.
Do not build the group too thinly. A pair or trio of Neon Tetras rarely gives the calm, confident effect people expect from the species. A group of six is workable, ten or more is better, and larger planted tanks can carry a bigger group beautifully when filtration and maintenance are suitable.
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