Gardneri Killifish
Fundulopanchax gardneri
Min Tank Size
40L
Adult Size
7.5 cm
Lifespan
3 years
About
Gardneri killifish come from the streams and forest pools of Nigeria and Cameroon, and they're one of those fish that genuinely stop people mid-scroll when they first see a photo. Males carry vivid blue-green bodies covered in red and orange spots arranged in loose rows, with unpaired fins that often show yellow or orange edging. Females are considerably plainer, brownish with faint spotting, but that contrast actually helps you manage the group dynamics more easily.
5 cm, they fit comfortably in tanks starting around 40 liters, though more space makes keeping multiple individuals much less fraught. Water parameters are forgiving compared to many killifish. 5. They're not demanding about pristine water chemistry the way some of their relatives are, which is a big part of why they're considered a gateway killifish for beginners.
Diet should lean heavily on live and frozen foods. Daphnia, bloodworms, brine shrimp and similar fare keep them in top condition and bring out the best coloration. They'll accept quality dry foods but thrive when live options are part of the rotation.
Temperament sits in a middle ground: peaceful toward most heterospecific tankmates but genuinely territorial and sometimes aggressive toward their own kind, particularly male-to-male. Float a look at community builds featuring this species if you want to see how their color holds up against planted backgrounds.
Water Parameters
Temperature
°CpH
GH
dGHKH
dKHSwimming Level
Flow Preference
Keeping multiple Gardneri Killifish together
Gardneri Killifish is mildly territorial. Small groups can work in spacious tanks with broken sightlines, but expect occasional squabbles.
Compatibility
Gardneri killifish work well with small, peaceful community fish that occupy similar or lower water columns. Tetras in the 3 to 5 cm range, small rasboras, pencilfish, and corydoras are all commonly kept with them successfully. Avoid anything small enough to be eaten whole, dwarf shrimp like neocaridina and caridina are genuinely at risk from adult males. Long-finned, slow-moving fish like bettas or fancy guppies are not good pairings, partly because killifish may harass them and partly because the visual similarity of colorful males can trigger aggression. Kept in a 60-liter or larger planted tank with appropriate tankmates, they're a highlight species rather than a problem.
Commonly kept with
Species this one is most often paired withCommonly tried but avoid
Often paired, but shouldn't beCare Notes
The most common beginner mistake is housing two males together and expecting a planted tank to solve the conflict. It usually doesn't. Another frequent issue is underfeeding variety: a male kept only on flake food gradually loses the intensity of his coloration. Live or frozen foods make a visible difference within weeks. These fish also jump with zero warning, so any gap in a lid is a risk. Slightly cooler temperatures toward the lower end of their range, around 22 to 23 degrees, tend to support longer lifespans. Running too warm shortens them noticeably.
Behavior & Aggression
Male gardneri killifish can be seriously aggressive toward each other, particularly in smaller tanks or when sightlines allow them to see each other constantly. Two males in a 40-liter will usually end up with one fish harassed to exhaustion. This isn't subtle nipping, it can escalate to genuine pursuit and fin damage. Dense planting and broken lines of sight reduce tension but don't eliminate it. Toward other species they're largely calm, though very small fish or juveniles may get harassed if they stray into a male's claimed territory.
Things to Know
- Males will fight each other, especially in smaller tanks. Keep one male per tank unless space is...
- Will eat dwarf shrimp and small nano fish that fit in their mouth.
- Excellent jumpers. A tight-fitting lid is essential.
- Keep 1 male to 2-3 females to reduce stress on individual females.
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