Photo: Sir Francis Day (Public domain) — via Wikimedia Commons
Golden Wonder Killifish (Aplocheilus lineatus)
A glittering surface hunter that stalks insects and small fish from the top layer — stunning to watch, but a menace to anything bite-sized.
Will it live with a Golden Wonder Killifish?
We compare each fish against your golden wonder killifish on temperament, size, water parameters and swimming zone. Set your tank size and filter the results.
- Adolf's Cory✅ CompatiblePeaceful · 5.5 cm · Medium care · 22–26 °C (72–79 °F)
- Compatible on the things that matter: shared water near 22–26 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Adolf's Cory in a shoal of 6+ or it gets stressed and nippy.
- Agassiz's Corydoras✅ CompatiblePeaceful · 6 cm · Easy care · 22–28 °C (72–82 °F)
- Compatible on the things that matter: shared water near 22–28 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Agassiz's Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Banjo Catfish✅ CompatiblePeaceful · 15 cm · Medium care · 20–26 °C (68–79 °F)
- Compatible on the things that matter: shared water near 22–26 °C, workable temperaments, and no predator-and-prey size gap.
- Black Kuhli Loach✅ CompatiblePeaceful · 8 cm · Easy care · 23–28 °C (73–82 °F)
- Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Blood Red Tiger Pleco✅ CompatiblePeaceful · 6 cm · Medium care · 24–29 °C (75–84 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 24–28 °C — no size, zone or temperament conflicts.
- Bolivian Ram✅ CompatiblePeaceful · 8 cm · Medium care · 24–28 °C (75–82 °F)
- Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Burmese Loach✅ CompatiblePeaceful · 9 cm · Easy care · 22–28 °C (72–82 °F)
- Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Corydoras Catfish✅ CompatiblePeaceful · 6.5 cm · Easy care · 22–26 °C (72–79 °F)
- Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
- Duplicareus Corydoras✅ CompatiblePeaceful · 5.5 cm · Medium care · 23–27 °C (73–81 °F)
- Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Duplicareus Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Elegant Cory✅ CompatiblePeaceful · 6 cm · Easy care · 22–28 °C (72–82 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 22–28 °C — no size, zone or temperament conflicts.
- Keep Elegant Cory in a shoal of 6+ or it gets stressed and nippy.
- False Julii Corydoras✅ CompatiblePeaceful · 6 cm · Easy care · 22–26 °C (72–79 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
- Keep False Julii Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Giant Betta✅ CompatiblePeaceful · 12 cm · Medium care · 24–28 °C (75–82 °F)
- Compatible on the things that matter: shared water near 24–28 °C, workable temperaments, and no predator-and-prey size gap.
- Giant Kuhli Loach✅ CompatiblePeaceful · 12 cm · Easy care · 24–30 °C (75–86 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 24–28 °C — no size, zone or temperament conflicts.
- Kuhli Loach✅ CompatiblePeaceful · 10 cm · Easy care · 24–30 °C (75–86 °F)
- Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Leopard Frog Pleco✅ CompatiblePeaceful · 9 cm · Medium care · 25–30 °C (77–86 °F)
- Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Murray River Rainbowfish✅ CompatiblePeaceful · 11 cm · Easy care · 15–26 °C (59–79 °F)
- Compatible on the things that matter: shared water near 22–26 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Murray River Rainbowfish in a shoal of 6+ or it gets stressed and nippy.
- Narcissus II Cory✅ CompatiblePeaceful · 5.5 cm · Medium care · 22–26 °C (72–79 °F)
- Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Narcissus II Cory in a shoal of 6+ or it gets stressed and nippy.
- Peppered Corydoras✅ CompatiblePeaceful · 7 cm · Easy care · 18–26 °C (64–79 °F)
- Semi-aggressive + Peaceful, but with no direct clash here, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
- Keep Peppered Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Rust Corydoras✅ CompatiblePeaceful · 5.5 cm · Easy care · 23–27 °C (73–81 °F)
- Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Slate Corydoras✅ CompatiblePeaceful · 6 cm · Medium care · 23–28 °C (73–82 °F)
- Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Slate Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Spotfin Corydoras✅ CompatiblePeaceful · 6.5 cm · Easy care · 22–26 °C (72–79 °F)
- Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Spotfin Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Spotted Corydoras✅ CompatiblePeaceful · 7 cm · Easy care · 22–27 °C (72–81 °F)
- Semi-aggressive + Peaceful, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Spotted Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Spotted Rubbernose Pleco✅ CompatiblePeaceful · 12 cm · Medium care · 20–26 °C (68–79 °F)
- Compatible on the things that matter: shared water near 22–26 °C, workable temperaments, and no predator-and-prey size gap.
- Sterbai Corydoras✅ CompatiblePeaceful · 6.5 cm · Medium care · 24–30 °C (75–86 °F)
- Compatible on the things that matter: shared water near 24–28 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Sterbai Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Afra Cichlid⚠️ With cautionSemi-aggressive · 10 cm · Medium care · 24–28 °C (75–82 °F)
- Different pH ranges (6–7.5 vs 7.8–8.6); doable if you sit in the shared band, but not ideal long-term.
- Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
- Your 75 L tank is below the ~150 L this pairing really wants — crowding raises aggression.
- Keep Afra Cichlid in a shoal of 6+ or it gets stressed and nippy.
- Bearded Corydoras⚠️ With cautionPeaceful · 10 cm · Medium care · 18–24 °C (64–75 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Bearded Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Clown Rasbora⚠️ With cautionPeaceful · 10 cm · Medium care · 23–28 °C (73–82 °F)
- Golden Wonder Killifish is semi-aggressive and may chase or nip the smaller Clown Rasbora — plant heavily and break up sight lines.
- Your 75 L tank is below the ~110 L this pairing really wants — crowding raises aggression.
- Keep Clown Rasbora in a shoal of 6+ or it gets stressed and nippy.
- Daffodil Cichlid⚠️ With cautionSemi-aggressive · 10 cm · Medium care · 23–27 °C (73–81 °F)
- pH preferences only just meet (Golden Wonder Killifish 6–7.5 vs Daffodil Cichlid 7.8–9) — target the overlap and acclimate slowly.
- Golden Wonder Killifish and Daffodil Cichlid can both be territorial; doable with space and dense planting, but watch for chasing.
- Your 75 L tank is below the ~120 L this pairing really wants — crowding raises aggression.
- Electric Yellow Cichlid⚠️ With cautionSemi-aggressive · 10 cm · Medium care · 23–26 °C (73–79 °F)
- Different pH ranges (6–7.5 vs 7.8–8.9); doable if you sit in the shared band, but not ideal long-term.
- Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
- Your 75 L tank is below the ~200 L this pairing really wants — crowding raises aggression.
- Giant Danio⚠️ With cautionPeaceful · 10 cm · Easy care · 20–27 °C (68–81 °F)
- Golden Wonder Killifish and Giant Danio are close in size, but the semi-aggressive one tends to dominate — add giant danio in a group to spread the pressure.
- Your 75 L tank is below the ~110 L this pairing really wants — crowding raises aggression.
- Keep Giant Danio in a shoal of 6+ or it gets stressed and nippy.
- Keyhole Cichlid⚠️ With cautionPeaceful · 10 cm · Easy care · 22–28 °C (72–82 °F)
- Golden Wonder Killifish and Keyhole Cichlid are close in size, but the semi-aggressive one tends to dominate — add keyhole cichlid in a group to spread the pressure.
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Kribensis⚠️ With cautionSemi-aggressive · 10 cm · Easy care · 24–27 °C (75–81 °F)
- Golden Wonder Killifish and Kribensis can both be territorial; doable with space and dense planting, but watch for chasing.
- Molly⚠️ With cautionPeaceful · 10 cm · Easy care · 23–28 °C (73–82 °F)
- Expect Golden Wonder Killifish to harass Molly at times; give dense cover and watch them at feeding.
- Porthole Catfish⚠️ With cautionPeaceful · 10 cm · Easy care · 22–28 °C (72–82 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Rosy Barb⚠️ With cautionSemi-aggressive · 10 cm · Easy care · 18–26 °C (64–79 °F)
- Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
- Keep Rosy Barb in a shoal of 6+ or it gets stressed and nippy.
- Rusty Cichlid⚠️ With cautionSemi-aggressive · 10 cm · Medium care · 24–28 °C (75–82 °F)
- pH preferences only just meet (Golden Wonder Killifish 6–7.5 vs Rusty Cichlid 7.8–8.5) — target the overlap and acclimate slowly.
- Golden Wonder Killifish and Rusty Cichlid can both be territorial; doable with space and dense planting, but watch for chasing.
- Your 75 L tank is below the ~150 L this pairing really wants — crowding raises aggression.
- Tanganyikan Butterfly Cichlid⚠️ With cautionSemi-aggressive · 10 cm · Hard care · 24–28 °C (75–82 °F)
- pH preferences only just meet (Golden Wonder Killifish 6–7.5 vs Tanganyikan Butterfly Cichlid 8–9) — target the overlap and acclimate slowly.
- Golden Wonder Killifish and Tanganyikan Butterfly Cichlid can both be territorial; doable with space and dense planting, but watch for chasing.
- Your 75 L tank is below the ~130 L this pairing really wants — crowding raises aggression.
- Topaz Cichlid⚠️ With cautionSemi-aggressive · 10 cm · Medium care · 23–28 °C (73–82 °F)
- Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
- Upside-down Catfish⚠️ With cautionPeaceful · 10 cm · Easy care · 22–26 °C (72–79 °F)
- Your 75 L tank is below the ~115 L this pairing really wants — crowding raises aggression.
- Zebra Pleco⚠️ With cautionPeaceful · 10 cm · Hard care · 26–30 °C (79–86 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Alligator Gar⛔ Not recommendedAggressive · 250 cm · Hard care · 24–28 °C (75–82 °F)
- Two assertive fish, one genuinely aggressive: Golden Wonder Killifish and Alligator Gar will hold territory and clash.
- Size gap is too large (250 vs 10 cm): Alligator Gar will treat Golden Wonder Killifish as food.
- Your 75 L tank is below the ~3785 L this pairing really wants — crowding raises aggression.
- Clown Knifefish⛔ Not recommendedAggressive · 90 cm · Hard care · 24–28 °C (75–82 °F)
- Golden Wonder Killifish and Clown Knifefish are both territorial and at least one is outright aggressive — expect serious fighting.
- Golden Wonder Killifish is bite-sized to a 90 cm predatory clown knifefish — it will be eaten.
- Your 75 L tank is below the ~750 L this pairing really wants — crowding raises aggression.
- Fire Eel⛔ Not recommendedSemi-aggressive · 100 cm · Medium care · 24–28 °C (75–82 °F)
- Fire Eel (100 cm) is big enough to swallow the 10 cm Golden Wonder Killifish whole.
- Both are a bit pushy (semi-aggressive + semi-aggressive) — workable only in a larger tank with cover and broken sight lines.
- Your 75 L tank is below the ~380 L this pairing really wants — crowding raises aggression.
- Koi⛔ Not recommendedPeaceful · 90 cm · Medium care · 4–28 °C (39–82 °F)
- Size gap is too large (90 vs 10 cm): Koi will treat Golden Wonder Killifish as food.
- Your 75 L tank is below the ~3800 L this pairing really wants — crowding raises aggression.
- Redtail Catfish⛔ Not recommendedAggressive · 120 cm · Hard care · 24–27 °C (75–81 °F)
- Two assertive fish, one genuinely aggressive: Golden Wonder Killifish and Redtail Catfish will hold territory and clash.
- Golden Wonder Killifish is bite-sized to a 120 cm predatory redtail catfish — it will be eaten.
- Your 75 L tank is below the ~5700 L this pairing really wants — crowding raises aggression.
- Spotted Gar⛔ Not recommendedAggressive · 90 cm · Hard care · 18–26 °C (64–79 °F)
- Two assertive fish, one genuinely aggressive: Golden Wonder Killifish and Spotted Gar will hold territory and clash.
- Golden Wonder Killifish is bite-sized to a 90 cm predatory spotted gar — it will be eaten.
- Your 75 L tank is below the ~600 L this pairing really wants — crowding raises aggression.
- Wels Catfish⛔ Not recommendedAggressive · 300 cm · Hard care · 15–25 °C (59–77 °F)
- Two assertive fish, one genuinely aggressive: Golden Wonder Killifish and Wels Catfish will hold territory and clash.
- Golden Wonder Killifish is bite-sized to a 300 cm predatory wels catfish — it will be eaten.
- Your 75 L tank is below the ~20000 L this pairing really wants — crowding raises aggression.
- Wolf Cichlid⛔ Not recommendedAggressive · 72 cm · Hard care · 24–30 °C (75–86 °F)
- Golden Wonder Killifish and Wolf Cichlid are both territorial and at least one is outright aggressive — expect serious fighting.
- Wolf Cichlid (72 cm) is big enough to swallow the 10 cm Golden Wonder Killifish whole.
- Your 75 L tank is below the ~760 L this pairing really wants — crowding raises aggression.
Compatibility is computed from each species' care data — a strong starting point, not a guarantee. Individual temperament varies, so always introduce new fish slowly and watch them.
Golden Wonder Killifish care specs
- Care level
- Easy
- Breeding
- Medium
- Max size
- 10 cm (3.9 in)
- Min tank size
- 75 L (19.8 gal)
- Temperature
- 22–28 °C (72–82 °F)
- pH
- 6–7.5
- Hardness
- 5–15 dGH
- Lifespan
- 3–5 years
- Diet
- Carnivore
- Swim level
- Top
- Group size
- Best alone or in a pair
- Family
- Aplocheilidae
- Origin
- South Asia — peninsular India and Sri Lanka (slow streams, ponds, rice paddies)
What is a Golden Wonder Killifish?
The Golden Wonder Killifish (Aplocheilus lineatus), also known as the Striped panchax or Malabar killifish, is one of the most visually striking surface-dwelling fish available in the hobby. Its body shimmers with a gold-yellow base colour, each scale catching the light differently, while a dark lateral stripe runs along the flank and the fins often show hints of orange and yellow. The upturned mouth is a dead giveaway for its lifestyle: this fish was built to hunt from below the surface film.
Despite that predatory nature, Golden Wonder Killifish are among the more beginner-accessible killifish. They accept a broad range of water parameters, take frozen and even dry foods without much fuss, and are active and visible during the day — a welcome contrast to shy or nocturnal species. Reaching up to 10 cm (4 in), they are also larger and more robust than many killifish, which adds to their appeal. The main caveats are a secure, tight-fitting lid (these fish can jump cleanly out of an uncovered tank), careful tank-mate selection, and keeping males apart to prevent territorial clashes.
Where do Golden Wonder Killifish come from?
Aplocheilus lineatus is native to peninsular India and Sri Lanka, where it inhabits slow-moving or still freshwater environments: irrigation canals, rice paddies, roadside ditches, ponds, and sluggish streams. These are typically warm, shallow, and well-vegetated, often with dense floating plants at the surface. Water chemistry varies widely across this range — from soft, slightly acidic conditions in forested areas to harder, more neutral water in agricultural zones — which explains the species’ adaptability in captivity.
The “Golden Wonder” trade name refers to a selectively bred colour morph of the wild striped panchax. Wild-type fish are less intensely coloured, with more obvious banding, while the captive-bred golden morph has been developed for maximum iridescence. Both share the same care requirements.
What size tank does a Golden Wonder Killifish need?
The minimum recommended tank size is 75 litres (20 gallons). These are active, predatory fish that cruise the entire length of the surface, so tank footprint matters more than height — a longer, shallower aquarium works better than a tall, narrow one. A standard 90 cm (36 in) long tank is a solid starting point.
Because the Golden Wonder Killifish is a top-dweller that pays little attention to the lower water column, it pairs well in a community setup with mid- and bottom-level species, making efficient use of vertical space. Floating plants such as frogbit or water sprite are strongly recommended: they diffuse the light (which the fish appreciates), provide cover, and encourage natural surface-patrolling behaviour. Surface agitation from the filter should be moderate — still or gently moving water suits this species better than strong flow.
A tight-fitting lid with no gaps is not optional. Golden Wonder Killifish are exceptional jumpers and will exploit any opening.
What water parameters do Golden Wonder Killifish need?
- Temperature: 22–28 °C (72–82 °F). They tolerate a cooler range than many tropicals, but a stable temperature within this band is important.
- pH: 6.0–7.5 — slightly acidic to neutral.
- Hardness: 5–15 dGH — soft to moderately hard.
These are forgiving parameters that match a wide range of tap water supplies, which is one reason this species is recommended for beginners. That said, stability always matters more than hitting an exact figure. Cycle the tank fully before introducing fish, perform weekly water changes of around 20–25%, and avoid sudden temperature swings. Warm, shallow, still water can accumulate waste quickly, so consistent maintenance is essential.
What do Golden Wonder Killifish eat?
Golden Wonder Killifish are dedicated carnivores with a strong preference for surface prey. In the wild they take insects, insect larvae, and small invertebrates that fall onto or just below the water surface. In an aquarium the best staples are:
- Live or frozen foods: mosquito larvae, daphnia, bloodworms, and brine shrimp are all eagerly accepted and bring out the best colouration.
- Floating pellets or granules: most individuals can be trained onto a quality carnivore or micropredator floating pellet, which works well as an everyday base food.
- Flake food: accepted by many individuals but less nutritious than pellets or meaty foods; best used as an occasional supplement rather than a staple.
Feed small portions twice daily and remove anything uneaten after a few minutes. Because these fish feed at the surface in warm, often still water, leftover food degrades quickly and fouls the water. A varied diet rich in live and frozen items keeps fish in prime condition and supports breeding readiness.
Are Golden Wonder Killifish aggressive — and what fish can live with them?
The Golden Wonder Killifish is rated semi-aggressive, and its aggression is primarily predatory rather than territorial. The rule of thumb is simple: if a tank mate fits in the killifish’s mouth, it will eventually end up there. Small tetras, nano fish, dwarf rasboras, and shrimp are not safe companions. Males will also harass each other when kept together in close quarters — one male per tank is the most reliable arrangement.
Good tank-mate choices are mid-sized, robust species that occupy lower water levels and are not so small as to be mistaken for prey. Larger danios, medium-sized livebearers (mollies, platies, swordtails), rainbowfish, and peaceful cichlids that hold their own all tend to work well. Bottom-dwellers like larger corydoras or loaches are also compatible, since they rarely share the surface zone. Avoid fin-nipping species, as the killifish’s relatively large, active profile can provoke nipping from opportunistic tank mates.
For a full rundown of tested pairings, see Golden Wonder Killifish tank mates.
How do you tell male and female Golden Wonder Killifish apart?
Sexing adults is straightforward once they have grown on. Males are more intensely gold, with brighter iridescent scale edges, more vivid fin colouration, and a slimmer, more streamlined body profile. Females are slightly larger and fuller-bodied — a rounder belly is especially obvious when a female is gravid — and their colouration is more subdued, with less intense gold tones and less pronounced markings. In some individuals the male’s dorsal and caudal fins also show additional colour accents that are absent or muted in females.
Juveniles can be difficult to sex reliably until they approach adult size at around 5–6 cm (2–2.5 in). When purchasing fish, look for a mix of body shapes and let them grow out if you plan to breed them.
How do Golden Wonder Killifish breed?
Breeding is rated medium difficulty — achievable for an attentive beginner, but it requires some preparation. Golden Wonder Killifish are egg-scatterers that deposit adhesive eggs among fine-leaved plants or spawning mops near the surface, rather than guarding a nest site. Spawning can occur continuously in a well-conditioned pair over several weeks.
To breed them intentionally:
- Condition the pair for one to two weeks on a diet of live or frozen mosquito larvae and daphnia.
- Set up a spawning tank of around 40–60 L (10–15 gal) with dense Java moss, fine-leaved plants, or a spawning mop positioned near the surface. Keep the water at the warmer end of the range (around 26–28 °C / 79–82 °F).
- Introduce the pair and watch for the male courting the female at the surface. The female deposits a few eggs at a time, which the male fertilises; eggs adhere to plant material.
- Remove eggs to a separate rearing container (or remove the adults after spawning if using a heavily planted tank), as adults will eat eggs and fry.
- Fry hatch in approximately 12–14 days at 26 °C. They are relatively large at hatching and can take baby brine shrimp nauplii or micro worms from day one.
Keep fry separated by size as they grow, as larger siblings will predate smaller ones.
What are common Golden Wonder Killifish diseases?
Golden Wonder Killifish are generally hardy, but several diseases are worth knowing:
- Ich (white spot disease): Small white spots across the body and fins, often triggered by a sudden temperature drop or introducing unquarantined fish. Prevention: stable temperature, quarantine all new fish for two to four weeks before adding them to the display tank.
- Velvet (Oodinium): A fine gold or rust-coloured dusting, most visible under a side light. Often enters a tank via new fish or live food. Prevention: same quarantine protocol as for ich; avoid wild-caught live food from unknown sources.
- Bacterial fin rot: Ragged, fraying fin edges, usually linked to poor water quality or physical injury. Prevention: consistent water changes, avoiding overcrowding, and keeping sharp décor or fin-nipping tank mates out of the aquarium.
- Internal parasites: Occasional in wild-caught specimens; signs include hollow belly despite a good appetite. Prevention: source fish from reputable breeders; quarantine new arrivals.
The common thread is that a clean, stable, well-maintained tank prevents the vast majority of health problems in this species.
Health note: disease diagnosis in fish can be difficult even for experienced keepers. Confirm symptoms against a reputable veterinary or fish-health source before reaching for medication — misidentification and incorrect treatment do more harm than good.
How long do Golden Wonder Killifish live?
With good care, Golden Wonder Killifish live 3–5 years. They are not particularly long-lived compared to some aquarium fish, but within that lifespan they reward attentive keepers with bold behaviour, striking colour, and — if breeding is attempted — a genuinely engaging spawning process. The biggest factors shortening their lives are poor water quality, chronic stress from incompatible tank mates, and inadequate diet. Provide stable, clean water, appropriate companions, and a varied carnivore diet, and you can expect to see them at their glittering best throughout their natural lifespan.
Frequently asked questions
Can I keep Golden Wonder Killifish with other fish?
Yes, but choose tank mates carefully: anything small enough to swallow — nano fish, small tetras, dwarf rasboras, shrimp — will eventually become prey. Stick to robust mid-sized fish like larger danios, rainbowfish, or medium-sized livebearers. One male per tank avoids male-on-male aggression, and a tight-fitting lid is non-negotiable since they are accomplished jumpers.
How do I breed Golden Wonder Killifish?
Condition a pair on live or frozen foods such as mosquito larvae and daphnia. They scatter adhesive eggs among fine-leaved plants or a spawning mop near the surface. Remove eggs to a separate container or use a heavily planted tank so adults cannot easily locate them. Fry hatch in about 12–14 days and are large enough to take baby brine shrimp immediately.
What you need to keep a golden wonder killifish
The baseline is a heated, filtered 75 L+ tank: a reliable heater to hold 22–28 °C (72–82 °F), a gentle filter that won't batter a golden wonder killifish in the current, and a tight-fitting lid. Cycle the tank fully before adding any fish.
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