Can African Knifefish and Gardner's Killifish Live Together?
Keeping African Knifefish and Gardner's Killifish together is possible but requires caution due to potential behavioral clashes. Provide a spacious tank of at least 200 litres with plenty of hiding spots to reduce stress. Monitor behaviour closely, especially during the first few weeks.
At a Glance
Can your tank handle African Knifefish and Gardner's Killifish?
Compatibility is only part of the answer. Test both fish with your real tank size, current stock, and maintenance needs to see if you have enough space and a safe stocking level before you add them.
Shared setup supplies
We may earn from qualifying purchases
Behaviour & Temperament
African Knifefish is a moderately assertive species (5/10), while Gardner's Killifish is generally mild-mannered (4/10). This modest difference means African Knifefish may occasionally assert dominance over Gardner's Killifish.
African Knifefish and Gardner's Killifish both frequent the Middle (Open Water) region of the setup. This overlap can increase competition for space, so providing ample room and cover is important to keep both species comfortable.
Additional behavioural considerations to keep in mind: Hyperactive swimmers can stress shy, slow-moving species through constant motion.
Worth noting: African Knifefish is nocturnal and will be most active after lights-out, naturally reducing daytime encounters. Also, Gardner's Killifish is a known jumper, so a tight-fitting lid is essential.
To improve the chances of a peaceful coexistence in this community tank: A larger aquarium with ample hiding spots can help diffuse aggression and give the less dominant fish space to retreat.
Water Parameters
The safe temperature window for both species falls between 23°C and 26°C. Aim for the midpoint of this range (around 24.5°C) for optimal comfort.
Both fish can tolerate a pH between 6 and 7.5. Maintaining a stable value within this band is more important than hitting an exact number.
For general hardness, the shared comfort zone is 4–10 dGH. Regular testing will ensure conditions stay within this range.
Water care products
We may earn from qualifying purchases
Tank Setup
To house African Knifefish and Gardner's Killifish together, plan for an aquarium of at least 200 litres with a minimum length of 120 cm. This recommendation combines the stricter species minimums with a community-load allowance so the pairing has realistic long-term space and filtration headroom.
Because this pairing requires extra vigilance, include plenty of hiding spots — caves, driftwood, and dense plant clusters — so the less dominant fish can retreat when needed.
Specific environmental needs for this combination include: Driftwood (Digestion/Hiding), Smooth Gravel (Sensitive Barbels), Plants - Floating, Plants - Densely covered, Plants - lighly covered. Meeting these requirements will help both species thrive.
Both species do well with low (still water) water movement, so a standard filtration setup rated for the tank volume should suffice.
Suitable Tank Sizes
Standard aquarium sizes large enough for both African Knifefish and Gardner's Killifish.
55 Gallon Standard
60 Gallon Breeder
75 Gallon Standard
90 Gallon Standard
125 Gallon Standard
150 Gallon High
Feeding products to consider
We may earn from qualifying purchases
.webp?2026-04-25T14%3A35%3A38.022Z)
Frequently Asked Questions
Can African Knifefish and Gardner's Killifish live together?
They can coexist, but the pairing requires careful monitoring. Provide ample space (at least 200 litres), plenty of hiding spots, and watch for signs of stress or aggression.
What size tank do African Knifefish and Gardner's Killifish need?
A minimum of 200 litres (tank length at least 120 cm) is recommended. This provides enough space for both species to establish their own areas and reduces the likelihood of territorial disputes.
What water temperature is best for African Knifefish and Gardner's Killifish together?
Keep the aquarium between 23°C and 26°C. A target of around 24.5°C sits comfortably within both species' preferred ranges.
Are African Knifefish or Gardner's Killifish aggressive?
African Knifefish is moderately assertive (5/10) and Gardner's Killifish is generally mild-mannered (4/10). Their similar temperaments generally lead to a peaceful coexistence.
What pH do African Knifefish and Gardner's Killifish need?
Both species overlap in the 6–7.5 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.
Does African Knifefish being nocturnal affect compatibility?
African Knifefish is most active after lights-out, which naturally reduces daytime encounters with its tank mate. This can actually be beneficial, as both fish get undisturbed time to feed and explore. Just ensure food reaches African Knifefish during evening hours.
Related Comparisons
African Knifefish & Reedfish (Ropefish)
·
African Knifefish & African Arowana
·
African Knifefish & Arapaima
·
African Knifefish & Black Ghost Knifefish
·
African Knifefish & Buettikoferi Bichir
·
African Knifefish & Clown Knifefish
·
Gardner's Killifish & Lyretail Killifish
·
Gardner's Killifish & Clown Killifish
·
Gardner's Killifish & Rachov's Killifish (Annual)
·
Gardner's Killifish & Florida Flagfish
·
Gardner's Killifish & Golden Wonder Killifish
·
Gardner's Killifish & Japanese Ricefish (Medaka)
·