Golden Wonder Killifish (Striped Panchax) Care Guide

The golden wonder killifish is a ~10 cm surface predator wearing a community-fish costume. It hangs at the top with a big upturned mouth and a hard-wired jumping instinct, and it eats anything small enough to fit — so the two facts that decide whether you keep it well are a sealed, gap-free lid and the right-sized tankmates.

Golden Wonder Killifish (Striped Panchax) at a glance

The sourced figures the welfare engine uses to judge Golden Wonder Killifish (Striped Panchax) — the parseable key facts.

Where it comes from

It is Aplocheilus lineatus, the striped panchax, from the streams, reservoirs, wells, swamps and low-lying paddy fields of peninsular India and Sri Lanka — a broad, adaptable range that even tolerates a touch of brackish water, which is part of why it is so hardy. The 'Golden Wonder' you see in shops is not the wild fish: the wild type is olive-green and silver with dark bars, while the dazzling metallic gold strain is a selectively-bred xanthic variant of the same species. The paddy-field life explains the fish. A flat back, an upturned mouth and a parietal 'third eye' on top of the head are all tools for holding station at the surface and snapping at insects above and around it, and the habit of jumping between drying pools is exactly why it leaps so readily in the aquarium. In its native range it is even used to eat mosquito larvae — the same appetite that makes it lethal to nano tankmates.

Did you know?

• It has a 'third eye' — a parietal eye on top of its head that helps it detect prey and predators above the water surface, perfect for a fish that hunts at the top.
• It is the giant of the Asian panchax group, the largest Aplocheilus at around 10 cm.
• In its native range it is used as a mosquito-control fish — the same surface appetite that makes it dangerous to tiny tankmates.
• The 'Golden Wonder' is man-made colour, a selectively-bred xanthic strain of a normally olive-green striped wild fish.
• Unlike the famous short-lived seasonal killifish, it comes from stable waters and can live several years.
• FishBase lists it as freshwater and brackish — it shrugs off a little salt, part of why it is so hardy.

Tank size — and why

Twenty US gallons is a sound floor for one fish or a trio, but a long, low tank of around 90 cm (roughly 30 gallons) is better and is what a one-male-several-females group really wants. The driver is not bioload — it is surface territory and adult size. This is a substantial 10 cm fish that owns the top of the tank and needs horizontal room to patrol it, so prioritise footprint and surface area over height; a tall, narrow tank wastes the space it actually uses.

As a guide, a 20-gallon tank comfortably suits about 1 Golden Wonder Killifish (Striped Panchax) as a single-species display, leaving room for tankmates.

How big does it really get?

Full-grown Golden Wonder Killifish (Striped Panchax) reach about 10 cm (3.9 in) long, but they are usually sold at only about 2.5 cm (1 in) — a typical shop size (estimate). At full size, Golden Wonder Killifish (Striped Panchax) needs roughly a 20-gallon tank, about 76 cm long; a common 10-gallon starter kit is only about 51 cm.

Adult size is sourced; the shop size is a typical-juvenile estimate; tank length is approximate for a standard 20-gallon aquarium.

Water parameters in practice

Refreshingly undemanding on chemistry for a killifish — it is one of the easier Aplocheilus to keep, comfortable across pH 6.0–7.5 and a broad hardness range to around 18 dGH. The point worth stressing is temperature: it wants a relatively cool, broad band of about 22–26 °C and is happy a little cooler than most tropical community fish, tolerating up to roughly 29 °C but never needing tropical heat. That makes it a poor match for a hot discus tank and a fine one for temperate-leaning communities. The real husbandry risks here are mechanical and social, not parameter fragility.

Diet & feeding

A genuine carnivore. In the wild it takes insects, crustaceans and even small fishes, and in the tank meaty foods should be the base: live or frozen bloodworm, white mosquito larvae, brine shrimp, daphnia and tubifex, offered floating because it feeds at the surface and tends to ignore food that has sunk. It will learn to take good dried flake or pellet for variety, but a dried-only diet is thin and dulls both colour and condition. Feed modest amounts once or twice a day. Remember that anything small and moving registers as food, tankmates included.

Gear & setup

The single most important piece of kit is a tight, gap-free lid — this is the number-one mechanical requirement and the leading avoidable killer of the species. It is an accomplished, powerful jumper, so every opening must be sealed: filter cut-outs, feeding flaps, cable holes. A lowered water line helps but is not a substitute for a proper cover. Beyond that it wants gentle to moderate flow, dense marginal planting and floating plants for surface cover and security, and a darker substrate with dimmer lighting to deepen its colour and settle it.

Temperament & behaviour

Peaceful only towards fish of its own size class. Among equals it is calm; between rival males it is territorial and will chase and damage fins, which is why a single fish or a female-skewed group works and several males in a small tank does not. Towards anything bite-sized it is simply a hunter — the 'peaceful community fish' label on the shop tank is the central trap with this species. It patrols the surface, strikes downward and around, and uses floating cover to break up lines of sight.

Group & social needs

Not a schooling fish. Keep it singly, as a pair, or — best — as one male with several females; some keepers run loose groups of six or more, but only with more females than males to spread the male's attention. A lone specimen is perfectly content. Multiple males in tight quarters is the social mistake to avoid.

Compatible tank mates (preview)

The engine clears no fish into a clear top set with Golden Wonder Killifish (Striped Panchax). It is not a species you can stock from a generic "peaceful community" list — shrimp, snails and small community fish are not safe defaults with it, so work from the temperament and tank-mate guidance in the sections above (and the full compatibility checker) rather than a quick shortlist.

This engine-cleared shortlist is Golden Wonder Killifish (Striped Panchax)'s tankmate surface for now — a dedicated tank-mates guide can follow for high-demand species.

Breeding & sexing

Easy to moderate, and far less fiddly than the famous 'annual' killifish because the eggs need no dry diapause. Sexing is clear: males are larger and brighter with elongated finnage, females plainer, plumper and more strongly barred. Condition a pair hard on live foods, raise the temperature to around 28 °C, and give them fine-leaved or floating plants or spawning mops at the surface. They are surface plant-spawners that scatter a few eggs daily over days or weeks; the eggs are large and tough-shelled, so they can be picked off and incubated separately, hatching in roughly 11–14 days. Rear the fry apart from the adults on microworm and baby brine shrimp.

Lifespan

Sources genuinely disagree, quoting anywhere from 2 to about 6 years; a realistic, well-kept figure is around 3–5 years, with 2 at the poor-conditions end and 6 exceptional. Either way it is a non-annual fish from stable waters and noticeably longer-lived than the short-lived seasonal killies. What shortens it most is the avoidable one — jumping out of an open or ill-fitted tank — followed by chronic stress in cramped quarters, male-on-male aggression, and a flake-only diet.

Common mistakes

• Buying it as a 'peaceful community fish.' It is a surface predator that eats neon tetras, micro-rasboras, Endlers, fry and dwarf shrimp — peaceful temperament towards equals is not the same as community-safe.
• No lid, or a lid with gaps. A powerful jumper; an open top, a filter cut-out or a feeding flap is a death trap. Seal every opening.
• Adding it to a dwarf-shrimp colony or a nano-fish tank. It will methodically clear them out — choose a shrimp/nano tank or a panchax tank, not both.
• Keeping several males in a small tank. Territorial chasing and fin damage; keep one male with several females instead.
• Feeding it like an omnivore. It is a carnivore; a flake-only diet dulls colour and shortens life.
• Trusting tankmate lists uncritically — at least one care source wrongly recommends cardinal tetras, which are exactly the prey size this fish eats.

Signs of trouble

• Loss of the gold sheen and clamped fins — general stress or a water-quality lapse.
• Hanging listlessly away from the surface and refusing food.
• Chasing, nipped fins and torn finnage among males kept together.
• White spot, velvet or fungal patches on long male fins, usually following stress.

Is this fish right for you?

Don't buy it if you keep, or want, nano fish or dwarf shrimp; if you can't seal the tank lid completely; if you only have a tall, small-footprint tank; or if you intend to house several males together in limited space. On stock quality there is good news: the Golden Wonder is a legitimate selectively-bred colour strain, widely tank-bred, not a dyed or balloon morph — so there is no artificial-morph welfare flag. The real welfare issue is point-of-sale mislabelling as community-safe.

Common questions

Can golden wonder killifish live with neon tetras or shrimp?

No. It is a surface micropredator that eats neon and cardinal tetras, micro-rasboras, Endlers, fry and dwarf shrimp — anything that fits in its mouth. Keep it only with fish too large to swallow that occupy the mid and lower levels.

Do golden wonder killifish jump?

Yes, and powerfully — it is the single most important thing to plan for. A tight, gap-free lid is mandatory, with filter cut-outs and feeding flaps sealed. Jumping out is the leading avoidable cause of death for this fish.

How many golden wonder killifish should I keep?

It is not a schooling fish. Keep one on its own, a pair, or one male with several females. Avoid keeping several males together in a small tank, as they are territorial with each other.

What temperature do golden wonder killifish need?

About 22–26 °C, tolerating up to roughly 29 °C. It runs cooler than most tropical community fish and does not want or need tropical heat, which makes it a poor match for a warm discus tank.

How big do golden wonder killifish get and how long do they live?

Around 10 cm (4 inches), commonly about 7 cm. Lifespan estimates vary widely from 2 to 6 years; plan for roughly 3–5 years with good care and a sealed lid.

Sources & confidence

Sources & confidence (1 species)

These back the Golden Wonder Killifish (Striped Panchax) figures and the previewed tank mates above. Each figure is read from the TankStocking species database (v2026.06); below is the care reference behind it and how confident we are in that data. Confidence reflects the source quality, not whether any pairing is safe. Full source list and the welfare model are on the methodology page.

• Golden Wonder Killifish (Striped Panchax) Aplocheilus lineatus — Aquadiction (aquadiction.world/species-spotlight/golden-wonder-panchax) high confidence

Care-guide sources (7)

This guide synthesises the references below; where they disagree, the range and the disagreement are noted in the text above. The figures in the key-facts box are read from the TankStocking species database (v2026.06). Full welfare model on the methodology page.

• FishBase — Aplocheilus lineatus — authority (Valenciennes 1846), family Aplocheilidae, range (peninsular India, Sri Lanka), paddy/stream/brackish habitat, max 10.0 cm TL / common 7.0 cm, wild temp 22–25 °C, trophic level 3.8, IUCN Least Concern
• Wikipedia — Striped panchax (Aplocheilus lineatus) — 10 cm size, ~6 yr under excellent conditions, Golden Wonder xanthic aquarium variant, wild diet 'insects, crustaceans, and even small fishes', parietal eye, 'can jump very well'
• Aquadiction — Golden Wonder Panchax — temp 22–26 °C, pH 6.0–7.5, GH 5–20, eats neon tetras and micro-rasboras, 'exceptional jumpers' needing a securely fitted lid, female-skewed groups, breeding (eggs, 12–14 day incubation), carnivore diet
• Shrimpy Business — Golden Wonder Killifish Care — 3–4 in, lifespan 3–5 yr, min 20 gal, 72–84 °F tolerated, top-dweller, solid lid for a good jumper, predatory on dwarf shrimp/micro-rasboras/danios, 11–14 day hatch
• AquaInfo — Aplocheilus lineatus — max 10 cm, temp 22–24 °C, 'mildly aggressive', 'only live food animals are considered as food', sexing, breeding (firm egg shell, remove from plants, ~28 °C), 'best kept as a pair or one male with several females'
• Aquatic Arts — Golden Wonder Killifish (Tank-Bred) — 3–4 in, min 20 gal, must be kept with a lid/hood or significantly lowered water level, 'fairly voracious predators of dwarf shrimp and even small fish such as microrasboras', eats 'any animal that will fit in its mouth', hardy and adaptable, tank-bred stock
• Fishkeeper.co.uk (Maidenhead Aquatics) — Golden Wonder Panchax — 10 cm, temp 22–25 °C, pH 6.5–7.5, dH up to 18, pair needs a 3 ft tank, 'Never be combined with small community fish e.g. Neon Tetras', 'accomplished jumpers… essential that the tank has tight fitting coverslides', males more colourful/larger, breeding 100–150 eggs, 11–14 day hatch

More on Golden Wonder Killifish (Striped Panchax)

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This care guide is a sourced planning reference, not veterinary advice — individual fish, filtration and maintenance all matter. Cycle the tank, test your water, and observe your fish. How TankStocking works →