Golden Wonder Killifish (Aplocheilus lineatus)

Family: Aplocheilidae

Golden Wonder Killifish — a Aplocheilidae from India to Sri Lanka, peaceful but delicate; best in a species setup. Reaches 7.5–11 cm; singly or in pairs; jump risk is real. 22–25 °C.

Care parameters

Water temperature
22–25 °C
pH
6.5–7.5
GH hardness
5–15 dGH
Adult length
7.5–11 cm
Minimum tank
145 L
Water layer
Middle of the water column
Difficulty
Moderate
Temperament
Peaceful but delicate; best in a species setup
Origin
India to Sri Lanka

Species overview

A Aplocheilidae species native to India to Sri Lanka: Aplocheilus lineatus lives middle of the water column over warm freshwater streams and lakes. Peaceful but delicate; best in a species setup. Adults reach 7.5–11 cm. In a community tank it pairs well with Other gentle surface fish.

Native biotope

Habitat
Warm freshwater streams and lakes
Flow
Still to gentle current
Dissolved O₂
Moderate oxygen levels

Aquascape & hardware

Substrate
Fine sand and gravel
Hardscape
Driftwood and smooth stones
Plants
Hardy common aquarium plants

Temperament, diet & tankmates

Schooling
Singly or in pairs; jump risk is real
Diet
Micropredator — live foods, small frozen fare
Recommended tankmates
  • Other gentle surface fish — Share the quiet upper water
Avoid keeping with
  • Uncovered tanks — They jump to their doom

Breeding & notes

Sexual dimorphism
Subtle external differences
Breeding method
Spawns in moss; store and rewet eggs to trigger hatching

Frequently asked questions

Is Golden Wonder Killifish easy to keep?

A moderate-level species: peaceful but delicate; best in a species setup; stable water matters more than fancy equipment.

What temperature and water chemistry does Golden Wonder Killifish need?

Hold 22–25 °C and keep it stable — 22–25 °C recorded range. Stable temperature matching the species origin.

How big does Golden Wonder Killifish get, and what tank size?

Full size is 7.5–11 cm. Minimum tank: 145 L, with open swimming space along its middle of the water column habits.

What does Golden Wonder Killifish eat?

Micropredator — live foods, small frozen fare. Vary the menu — quality flakes or pellets plus frozen or live foods.

Can Golden Wonder Killifish live with other fish?

Yes, with care. Peaceful but delicate; best in a species setup — pair it with Other gentle surface fish — Share the quiet upper water and skip Uncovered tanks — They jump to their doom.

Where does Golden Wonder Killifish come from?

Native to India to Sri Lanka, where it lives in warm freshwater streams and lakes. Still to gentle current; Moderate oxygen levels.

Does Golden Wonder Killifish jump?

Jumping is not a known issue; cover the tank anyway during water changes.

How does Golden Wonder Killifish breed?

In the aquarium: spawns in moss; store and rewet eggs to trigger hatching. Subtle external differences.