Golden Wonder Killifish

The Golden Wonder Killi (Aplocheilus lineatus) is a golden-scaled surface-dweller with subtle stripes, jumping predatorily in shallow setups. Peaceful yet opportunistic, it schools loosely in planted tanks, hunting insects at the top. Hardy and mosquito-controlling, the Golden Wonder Killi suits killifish biotypes or mixed communities.

Care Sheet – Golden Wonder Killi (Aplocheilus lineatus)

Temperament

• Peaceful, predatory jumper
• Best in groups of 6+ for schooling

Adult Size

• 3–4 inches

Minimum Tank Size

• 20 gallons long

Water Parameters

• Temperature: 72–82°F
• pH: 6.0–7.5
• Hardness: Soft to moderately hard (5–12 dGH)
• Ammonia/Nitrite: 0 ppm
• Nitrate: <20 ppm

Diet

• Carnivorous
• Live/frozen insects, brine shrimp, daphnia, flakes for surface feeders
• Feed small amounts 1–2× daily

Behavior & Compatibility

• Good with peaceful surface fish like hatchetfish, danios
• Avoid small fish; lid essential

Aquarium Setup

• Floating plants, open surface, gentle flow, moderate lighting
• Lidded tank to prevent jumps

Care Level

• Easy to moderate

Lifespan

• 3–5 years

Special Notes

• Golden scales shine at surface
• Excellent mosquito larvae eaters