Lampeye Tetra: Small African Nano Fish with Shimmering Eyes

Tiny at just 2–4 cm as adults, these West and Central African freshwater fish wear a glowing turquoise or copper band across the top of each eye, the very trait that earned them their common name. Despite the “tetra” label, these fish are not true tetras in the strict taxonomic sense, but small killifish-like relatives often sold to nano-tank hobbyists. Their peaceful temperament, schooling habit, and shimmering eye reflection make them a favorite display fish in heavily planted tanks.

You’ll find identification tips, natural habitat notes, tank setup, feeding, tank mates, breeding, and health troubleshooting ahead, all aimed at anyone keeping lampeye tetras in a planted or community aquarium.

The African Micro-Fish Behind the Name Lampeye

The name “lampeye” comes from a thin, brightly reflective layer of pigment on the upper half of each eye. In modest light it looks dull, but under a tank lamp the band flashes electric blue, turquoise, or copper, almost like a tiny headlamp. The display is thought to confuse predators by breaking up the fish’s silhouette in the dim, tannin-stained waters where it lives.

Size, Family, and Why They Are Not True Tetras

Adult lampeyes reach roughly 2–4 cm, which places them among the smallest schooling fish regularly available in the aquarium trade. The family link to the Characiformes is real, but most species sold as lampeyes sit closer to the killifish branch of the Cyprinodontiformes than to true tetras like neon or cardinal species. This is why some keepers and retailers call them lampeye killifish, even though the loose common name “lampeye tetra” has stuck in shops.

Common Species Sold Under the Lampeye Name

Several species share the lampeye label, and the names change often because of taxonomic reshuffling. Poropanchax normani, sold as Norman’s lampeye, is the most widely traded. Micropanchax lamberti is another common import, while the Tanganyika lampeye, Lacustricola pumilus, comes from lake-adjacent habitats in East Africa and tolerates slightly harder water than the West African species.

Scientific Name	Common Name	Origin	Adult Size
Poropanchax normani	Norman’s lampeye	West Africa	3–4 cm
Micropanchax lamberti	Lambert’s lampeye	West and Central Africa	2.5–3.5 cm
Lacustricola pumilus	Tanganyika lampeye	Lake Tanganyika region	3–4 cm

Where Lampeye Tetras Come From and How They Live

Wild lampeyes live in slow-moving streams, flooded forest pools, swamps, and the quiet edges of larger rivers across West and Central Africa. Dense overhanging vegetation usually shades the water, and falling leaves release tannins that turn the water tea-colored and slightly acidic. Those conditions are the baseline you want to copy in a home tank.

Water Chemistry and Biotope Cues

Most lampeye species prefer soft water with low to moderate general hardness and a pH sitting between about 6.0 and 7.2. Temperatures in their range run 22–26 °C year-round, and a gentle current is the rule. A practical biotope layout would include dark sand, sunken twigs, Indian almond leaves, and a thick mat of floating plants that diffuses overhead light.

Diet, Schooling, and Predator Avoidance

Zooplankton, tiny crustaceans, and insect larvae make up the bulk of the wild diet, picked from the water column rather than scraped off surfaces. In the wild they form loose schools of dozens of fish, scattering when threatened and using the reflective eye-spot to confuse predators in low light. A well-fed group in your tank will behave the same way, hovering mid-water in loose formation rather than hugging plants.

Setting Up a Tank That Mirrors Their Natural Waters

A 30-liter long-style tank is the practical minimum for a small group, and footprint matters more than height because lampeyes cruise the middle layer. A 45-liter or larger setup gives more room for both fish and aquascape without changing the core requirements.

Water Parameters That Keep Them Healthy

Target soft to moderately hard water, pH 6.0–7.2, and a steady temperature of 22–26 °C. Avoid sudden pH swings in soft water, because osmotic stress hits small fish faster than large ones. A simple sponge filter rated for the tank volume handles biological filtration and gentle flow at the same time, which is exactly what these fish expect.

Parameter	Ideal Range	Notes
Temperature	22–26 °C	Avoid swings above 1 °C per day
pH	6.0–7.2	Slightly acidic mimics blackwater habitat
GH	2–12 dGH	Soft preferred for most West African species
KH	1–6 dKH	Low buffering helps hold stable pH
Tank Size	30 L minimum	Long footprint over tall

Décor, Lighting, and Filtration Choices

Dark sand or fine gravel makes the eye-spot pop more than pale substrates, and floating plants such as Amazon frogbit or Salvinia soften overhead light. Use driftwood and dried leaves to release mild tannins, which both lower pH slightly and make the fish feel secure. Filter output should be baffled if the flow looks strong, because these fish do not enjoy a current they have to fight.

Replicating that gentle current matters most when the fish are already settled, which is why the next step is choosing food and companions that suit their calm rhythm.

“Tip: dim, indirect lighting is what brings lampeyes out into the open. Strong, direct light pushes them into plant cover where you never see the eye reflection at all.

Feeding, Schooling Behavior, and Choosing Tank Mates

Because they are micro-predators, lampeyes ignore standard dry food that is too large to fit in their mouths. A varied mix of small live and frozen items keeps them in good color and ready to breed, and a tight school of six or more brings out the eye-spot display on a daily basis.

Diet, Frequency, and Portion Size

Offer microworms, baby brine shrimp, daphnia, and finely crushed quality micro-pellets, rotating sources through the week. Two small feedings per day beat one large feeding, and any food left uneaten after three minutes should be siphoned out. Overfeeding a 30-liter tank collapses water quality fast, so portion control is part of lampeye tetra care, not a side note.

Tank Mates That Work and Ones to Skip

Small rasboras, ember tetras, celestial pearl danios, otocinclus, and peaceful dwarf corydoras all coexist well in a 45-liter or larger setup. Adult cherry or amano shrimp usually survive alongside lampeyes, though shrimplets may be picked off. Skip bettas, large gouramis, angelfish, and any fast-moving nano species that outcompete them at feeding time, because a hungry lampeye is a faded, stressed lampeye.

“Warning: a betta sharing a tank with lampeyes is a coin flip. Some individuals ignore the tiny fish entirely, but many treat them as live food once the reflective eye-spot catches their attention.

Sexing Lampeye Tetras and Breeding Them in a Home Aquarium

Sexing is straightforward once a group is settled. Males develop slightly elongated, often yellow-tinted fins and a brighter eye-spot, while females stay rounder in the belly and a touch larger overall. Conditioning both sexes heavily with live food over one to two weeks brings females into spawning condition, and a separate breeding tank gives eggs the best odds of survival.

Spawning Setup and Egg Collection

A 10–20-liter breeding tank with a small sponge filter, a few sprigs of java moss, and a spawning mop is enough. Transfer one or two females with two to three males in the evening, and within a day or two the fish scatter adhesive eggs across the moss and mop fibers. Pull the adults back to the main tank once you see eggs, because parents will hunt for them once the lights come back on.

Fry Care, First Foods, and Common Pitfalls

Eggs hatch in roughly 10–14 days depending on temperature, and the fry are tiny. Start them on infusoria or vinegar eels for the first week, then move to freshly hatched baby brine shrimp once they look large enough to take it. Keep the breeding tank dim, cover it loosely to cut evaporation, and add a small piece of Indian almond leaf to discourage fungus on any infertile eggs.

“Tip: a bare-bottom breeding tank makes it far easier to siphon waste and spot uneaten food before it pollutes the water.

Breeding Timeline at a Glance

1. 1Week 1: Condition breeders in the main tank on live food.
2. 2Day 1–3: Move conditioned fish to a moss-filled breeding tank.
3. 3Day 10–14: Eggs hatch into near-microscopic fry.
4. 4Week 3: Fry take baby brine shrimp and start showing color.
5. 5Week 8–10: Juveniles are large enough to join the main group safely.

Health Issues, Troubleshooting, and Long-Term Care Limits

Most lampeye losses trace back to water quality, mismatched tank mates, or stress from being kept in too-small a group. Because the fish are so small, illness can run through a colony in days, and prevention works much better than treatment.

Warning Signs Specific to Lampeyes

A fading or dull eye-spot is one of the earliest stress signals and often shows up before clamped fins or weight loss. Hanging near the surface, breathing faster than normal, or refusing food all point to water quality issues rather than disease. Quarantine any new fish for at least two weeks before adding them to a tank with an existing lampeye colony.

Common Mistakes and How to Fix Them

Ammonia spikes in soft water, sudden pH changes, and tank mates that nip fins are the three biggest killers. Run a tight water-change schedule, matching new water temperature and parameters to tank water before adding it. If you see torn fins, the culprit is almost always a tank mate, not a parasite, and separating the offender usually solves the problem overnight.

“Warning: most medications dosed for standard community fish will overdose a 2 cm lampeye. Treat the tank at half dose, or use a separate hospital container for the affected individual.

Lifespan, Yield, and Setting Realistic Expectations

A well-kept lampeye usually lives 3–5 years, with breeding yield in the dozens of eggs per spawn rather than hundreds. They are a slow, deliberate fish to keep, more of a showcase species for a quiet, planted tank than a hands-on pet. Treat them as a long-term display investment, and the eye-spot will reward you every time the room light catches the water.

Final Thoughts

Lampeye tetras are a peaceful, schooling, eye-catching nano fish that reward a soft, planted, dimly lit tank with steady water conditions. Focus on water stability, a group of six or more, and a varied micro-predator diet, and you will see those turquoise eye-bands flash across your tank on a regular basis. Skip fast tank mates, skip bright lights, and skip overfeeding, and the rest of the species-specific care falls into place on its own.

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