Also known as the gardneri killifish, the male shimmers steel-blue and turquoise dusted with crimson spots and yellow-edged fins. It is a hardy, jewel-toned introduction to the world of killifish keeping.
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Temperament
Common health issues
- Ich (white spot)
- Fin rot
- Parasites
- Skin conditions
Care at a glance
- ExerciseModerate
An active swimmer that appreciates open swimming space.
- GroomingRoutine tank care
Weekly partial water changes keep them in top shape.
- Living spaceNano-tank friendly
Happy in a small, stable, well-filtered tank.
- Owner experienceSome experience helps
A little know-how makes life smoother.
- Commitment2–3 years
Plan for a long, loving relationship.
Health to watch: Ich (white spot) · Fin rot · Parasites
📖 Care guide
The steel-blue killifish, Fundulopanchax gardneri, is one of the best beginner killifish because it is far more forgiving than many of its relatives, tolerating a range of conditions and readily accepting prepared foods. Males are spectacularly colored, and the species stays around two to two and a half inches, thriving in soft to moderately hard water around 72-79F in a well-covered, planted tank. Like most killies they are keen jumpers, so a tight lid is essential. Males can be feisty with one another, so keep either a single male with several females or a larger group in a spacious, densely planted tank to diffuse aggression. They relish live and frozen foods such as brine shrimp, daphnia, and blackworms, which condition them for prolific spawning among fine-leaved plants or spawning mops. Eggs can be incubated in water or on damp peat, making this a great gateway species for breeders.
Frequently asked questions
How active is a Steel-Blue Killifish?
Moderate. An active swimmer that appreciates open swimming space.
How much maintenance does a Steel-Blue Killifish need?
Routine tank care. Weekly partial water changes keep them in top shape.
What tank size does a Steel-Blue Killifish need?
Nano-tank friendly. Happy in a small, stable, well-filtered tank.
Is a Steel-Blue Killifish a good fit for first-time owners?
Some experience helps. A little know-how makes life smoother.
How long do Steel-Blue Killifish live?
2–3 years. Plan for a long, loving relationship.
What health issues affect the Steel-Blue Killifish?
Keep an eye out for Ich (white spot), Fin rot, Parasites. These are worth raising with your vet, along with any screening they recommend.
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