Can Lyretail Killifish and Parnahyba Whiptail Catfish Live Together?
Yes, Lyretail Killifish and Parnahyba Whiptail Catfish 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 110 litres is recommended.
At a Glance
Can your tank handle Lyretail Killifish and Parnahyba Whiptail Catfish?
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
Lyretail Killifish is a generally mild-mannered species (3/10), while Parnahyba Whiptail Catfish is peaceful (1/10). This modest difference means Lyretail Killifish may occasionally assert dominance over Parnahyba Whiptail Catfish.
In terms of spatial distribution, Lyretail Killifish prefers the Top (Surface) and Middle (Open Water) zones, whereas Parnahyba Whiptail Catfish occupies the Bottom (Substrate) zone. Because they use different levels of the water column, territorial disputes are less likely and the tank will appear more balanced.
Worth noting: Parnahyba Whiptail Catfish is nocturnal and will be most active after lights-out, naturally reducing daytime encounters. Also, Lyretail Killifish is a known jumper, so a tight-fitting lid is essential.
Water Parameters
The safe temperature window for both species falls between 24°C and 26°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 2–10 dGH. Regular testing will ensure conditions stay within this range.
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Tank Setup
To house Lyretail Killifish and Parnahyba Whiptail Catfish together, plan for an aquarium of at least 110 litres with a minimum length of 90 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 - Densely covered, Plants - Floating, Leaf Litter/Blackwater, Sand (Sifters), 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 Lyretail Killifish and Parnahyba Whiptail Catfish.
30 Gallon Breeder
40 Gallon Breeder
55 Gallon Standard
60 Gallon Breeder
75 Gallon Standard
90 Gallon Standard
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Frequently Asked Questions
Can Lyretail Killifish and Parnahyba Whiptail Catfish live together?
Yes. Lyretail Killifish and Parnahyba Whiptail Catfish are considered ideal tank mates. Their water parameters, temperaments, and behaviour profiles are well matched for a community aquarium.
What size tank do Lyretail Killifish and Parnahyba Whiptail Catfish need?
A minimum of 110 litres (tank length at least 90 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 Lyretail Killifish and Parnahyba Whiptail Catfish together?
Keep the aquarium between 24°C and 26°C. A target of around 25.0°C sits comfortably within both species' preferred ranges.
Are Lyretail Killifish or Parnahyba Whiptail Catfish aggressive?
Lyretail Killifish is generally mild-mannered (3/10) and Parnahyba Whiptail Catfish is peaceful (1/10). Their similar temperaments generally lead to a peaceful coexistence.
What pH do Lyretail Killifish and Parnahyba Whiptail Catfish 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 Parnahyba Whiptail Catfish being nocturnal affect compatibility?
Parnahyba Whiptail Catfish 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 Parnahyba Whiptail Catfish during evening hours.
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