Top 10 Killifish Species Roundup: Annual and Non-Annual
Killifish split the hobby into two camps — the annual species that complete a lifecycle in months and the non-annual perennials that live two to three years like any other tetra. The top 10 killifish species ranked here cover both groups, weighted toward Singapore-available picks rather than rare specialist imports. This roundup from Gensou Aquascaping at 5 Everton Park covers Aphyosemion, Nothobranchius and Aplocheilichthys lines suited to nano blackwater tanks under 30 litres. Each top 10 killifish species entry notes lifespan, group requirement and the water chemistry that triggers proper colouration. Killifish keepers in Singapore source most stock through specialist Carousell breeders or imported eggs in peat moss rather than mainstream local fish shops, since shop turnover does not justify the niche. Plan for a dedicated species tank rather than a community setup; killifish jumping behaviour and small-mouth predator instincts both complicate mixed stocking.
1. Clown Killifish (Epiplatys annulatus)
Striped tiger-pattern miniature surface dwellers from West African swamps. Adults stay 3.5cm and live 2-3 years. Group of eight in a 20-litre nano with floating plants. Iwarna lists captive-bred clown killis at SGD 8-15 each. They jump readily — a tight cover or floating mat from the aquatic plants range is non-negotiable.
2. Golden Wonder Killifish (Aplocheilus lineatus)
The golden form of the striped panchax — surface predator that hunts feeder shrimp. Adults reach 10cm and need a 75-litre tank with a tight lid. C328 stocks them at SGD 5-12. Outstanding mosquito control on outdoor balcony tubs but skip them with anything smaller than 4cm.
3. Gardneri Killifish (Fundulopanchax gardneri)
The classic killifish entry-point — non-annual, hardy, and shows yellow body with red speckling under blackwater. Adults stay 6cm; pair-bred 1 male to 3 females. Specialist Carousell breeders list captive-bred gardneri pairs at SGD 25-40. They breed continuously on java moss spawning mops.
4. Lampeye Killifish (Poropanchax normani)
The fluorescent-blue iris glow that earns the name. Adults reach 4cm and school loosely in groups of ten. Iwarna prices Norman’s lampeyes at SGD 4-8. Soft acidic blackwater conditioned with ANS Catappa Leaves Small deepens the eye-ring brightness within two weeks.
5. Blue Lyretail (Fundulopanchax gardneri lacustris)
The Lake Ejagham subspecies with extended lyre-shaped caudal lobes and powder-blue body. Adults reach 6cm; same pair structure as gardneri. SGD 30-50 from European-bred imports through specialist shops. The lyretail extensions tear in strong flow — keep filtration gentle.
6. Nothobranchius Rachovii (Nothobranchius rachovii)
The Mozambique fire killi — males flare iridescent red-and-blue rivalling any marine reef fish. Annual lifespan of 8-14 months. Adults reach 5cm. Carousell breeders sell rachovii eggs in peat moss for SGD 15-30 per spawn. Hatch in 4-6 weeks of dry storage. Soft acidic 24-26°C water essential.
7. Notho Guentheri (Nothobranchius guentheri)
The hardiest annual killi for beginners — Zanzibar origin, tolerates harder water than rachovii. Adults reach 6cm with bronze body and red-tipped fins. Eggs from local breeders run SGD 10-20. The first annual most hobbyists succeed with before tackling rachovii.
8. Aphyosemion Striatum (Aphyosemion striatum)
Five horizontal red stripes on a turquoise body — striking under planted-tank LEDs. Adults stay 5cm, non-annual, 2-year lifespan. Pair-bred breeding pairs from European stock reach SGD 35-55. Soft slightly acidic water at 22-24°C; cooler than most tropicals which suits HDB ambient.
9. Medaka Ricefish (Oryzias latipes)
Often grouped with killifish though technically separate family. Hi-yume blue, platinum and orange-red lines from Japanese breeders. Adults reach 4cm, school of eight, tolerates 18-28°C. C328 lists medaka at SGD 5-12; show-grade Japanese imports push past SGD 80. Outdoor tub-friendly when temperatures drop.
10. American Flagfish (Jordanella floridae)
Florida native with red-white-blue body that resembles the flag. Adults reach 6cm and eat hair algae aggressively — useful auxiliary cleaner. Iwarna stocks flagfish sporadically at SGD 8-15. Pair them with a QANVEE Bio Sponge Filter on low flow; flagfish dislike turbulence despite their sturdy build.
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