CheckMyFishTank

Golden Wonder Killifish care

Aplocheilus lineatus · Freshwater · Beginner level care

Golden Wonder Killifish, painted illustration

A hardy surface killifish with a golden body.

Smallest tank20 gallons
Adult size4 inches
Temperature75 to 80°F
pH6.5 to 7.5
GroupOne per tank
TemperamentSemi aggressive
SwimsTop of the tank
Lives3 to 5 years
Watch for: It will eat small fish and jump, so use a tight lid.

Feeding

Twice a day. A few pellets or a couple of frozen items per fish that are gone in a few minutes. Frozen foods, small live foods, floating pellets.

Eats fish small enough to fit in its mouth.

Jumps. Keep a tight lid on the tank.

Good tank mates

Fish that pass every check with Golden Wonder Killifish in a 40 gallon tank: same water, overlapping temperature, nobody gets eaten and no bullies.

Betta (Female)Betta (Male)Blue AcaraBlue GouramiBoesemani RainbowfishBrilliant RasboraBristlenose PlecoBronze CorydorasBuenos Aires TetraConvict Cichlid

Do not mix with

  • Neon Tetra: Golden Wonder Killifish grows big enough to eat Neon Tetra.
  • Green Neon Tetra: Golden Wonder Killifish grows big enough to eat Green Neon Tetra.
  • Black Neon Tetra: Golden Wonder Killifish grows big enough to eat Black Neon Tetra.
  • Ember Tetra: Golden Wonder Killifish grows big enough to eat Ember Tetra.
  • Glowlight Tetra: Golden Wonder Killifish grows big enough to eat Glowlight Tetra.
  • Marbled Hatchetfish: Golden Wonder Killifish grows big enough to eat Marbled Hatchetfish.
  • Tinfoil Barb: Tinfoil Barb grows big enough to eat Golden Wonder Killifish.
  • Celestial Pearl Danio: Golden Wonder Killifish grows big enough to eat Celestial Pearl Danio.

Questions

What size tank does a Golden Wonder Killifish need?

At least 20 gallons. Adults grow to about 4 inches, so plan for the adult size, not the size at the store.

What temperature does a Golden Wonder Killifish like?

75 to 80 degrees Fahrenheit, with a pH of about 6.5 to 7.5. A steady temperature matters more than hitting one exact number.

How many Golden Wonder Killifish should I keep together?

Keep only one. Golden Wonder Killifish fight their own kind.

What do Golden Wonder Killifish eat?

Frozen foods, small live foods, floating pellets. Feed twice a day: a few pellets or a couple of frozen items per fish that are gone in a few minutes.

Sources

Checked against these sources on 2026-11-10. When sources disagree we use the safer number.