Can Clown Killifish and Peter's Elephantnose Fish Live Together?
Yes, Clown Killifish and Peter's Elephantnose Fish are ideal tank mates. Both species share compatible water parameters and peaceful temperaments, making them well-suited for a community aquarium. They occupy different areas of the water column, which reduces competition for space. A minimum tank size of 200 litres is recommended.
At a Glance
Can your tank handle Clown Killifish and Peter's Elephantnose Fish?
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.
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Behaviour & Temperament
Clown Killifish is a peaceful species (2/10), while Peter's Elephantnose Fish is generally mild-mannered (4/10). This modest difference means Peter's Elephantnose Fish may occasionally assert dominance over Clown Killifish.
In terms of spatial distribution, Clown Killifish prefers the Top (Surface) zone, whereas Peter's Elephantnose Fish occupies the Bottom (Substrate) and Middle (Open Water) zones. Because they use different levels of the water column, territorial disputes are less likely and the tank will appear more balanced.
Worth noting: Peter's Elephantnose Fish is nocturnal and will be most active after lights-out, naturally reducing daytime encounters. Also, Clown Killifish is a known jumper, so a tight-fitting lid is essential.
Water Parameters
The safe temperature window for both species falls between 23°C and 27°C. Aim for the midpoint of this range (around 25.0°C) for optimal comfort.
Both fish can tolerate a pH between 6 and 7. Maintaining a stable value within this band is more important than hitting an exact number.
For general hardness, the shared comfort zone is 2–8 dGH. Regular testing will ensure conditions stay within this range.
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Tank Setup
To house Clown Killifish and Peter's Elephantnose Fish 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.
Providing a mix of open swimming space and sheltered areas with rocks, driftwood, or plants will keep both species comfortable and allow natural behaviour.
Specific environmental needs for this combination include: Plants - Floating, Plants - Densely covered, Leaf Litter/Blackwater, Sand (Sifters), Smooth Gravel (Sensitive Barbels), Plants - lighly covered, Driftwood (Digestion/Hiding). 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 Clown Killifish and Peter's Elephantnose Fish.
55 Gallon Standard
60 Gallon Breeder
75 Gallon Standard
90 Gallon Standard
125 Gallon Standard
150 Gallon High
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Frequently Asked Questions
Can Clown Killifish and Peter's Elephantnose Fish live together?
Yes. Clown Killifish and Peter's Elephantnose Fish are considered ideal tank mates. Their water parameters, temperaments, and behaviour profiles are well matched for a community aquarium.
What size tank do Clown Killifish and Peter's Elephantnose Fish 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 Clown Killifish and Peter's Elephantnose Fish together?
Keep the aquarium between 23°C and 27°C. A target of around 25.0°C sits comfortably within both species' preferred ranges.
Are Clown Killifish or Peter's Elephantnose Fish aggressive?
Clown Killifish is peaceful (2/10) and Peter's Elephantnose Fish is generally mild-mannered (4/10). Their similar temperaments generally lead to a peaceful coexistence.
What pH do Clown Killifish and Peter's Elephantnose Fish need?
Both species overlap in the 6–7 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.
Does Peter's Elephantnose Fish being nocturnal affect compatibility?
Peter's Elephantnose Fish 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 Peter's Elephantnose Fish during evening hours.
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