Can Cuckoo Catfish and Rummy-Nose Tetra Live Together?
Cuckoo Catfish and Rummy-Nose Tetra are not recommended as tank mates due to conflicting pH requirements. Housing these species together is likely to result in stress, health problems, or direct harm to one or both fish.
At a Glance
Can your tank handle Cuckoo Catfish and Rummy-Nose Tetra?
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
Cuckoo Catfish is a moderately assertive species (5/10), while Rummy-Nose Tetra is peaceful (1/10). This notable difference means Cuckoo Catfish may occasionally assert dominance over Rummy-Nose Tetra.
Cuckoo Catfish and Rummy-Nose Tetra both frequent the Middle (Open Water) and Bottom (Substrate) 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: Cuckoo Catfish is nocturnal and will be most active after lights-out, naturally reducing daytime encounters.
Water Parameters
The safe temperature window for both species falls between 24°C and 28°C. Aim for the midpoint of this range (around 26.0°C) for optimal comfort.
The pH requirements of Cuckoo Catfish (7.5–9) and Rummy-Nose Tetra (5.5–7) do not overlap, making it impossible to satisfy both species simultaneously.
For general hardness, the shared comfort zone is 10–12 dGH. Regular testing will ensure conditions stay within this range.
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Tank Setup
To house Cuckoo Catfish and Rummy-Nose Tetra together, plan for an aquarium of at least 340 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: Sand (Sifters), Smooth Gravel (Sensitive Barbels), Driftwood (Digestion/Hiding), Plants - Densely covered, Plants - lighly covered, Leaf Litter/Blackwater. Meeting these requirements will help both species thrive.
Both species do well with moderate (standard) water movement, so a standard filtration setup rated for the tank volume should suffice.
Suitable Tank Sizes
Standard aquarium sizes large enough for both Cuckoo Catfish and Rummy-Nose Tetra.
90 Gallon Standard
125 Gallon Standard
150 Gallon High
180 Gallon Standard
350 Liter (120cm Deep)
450 Liter (150cm Standard)
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Frequently Asked Questions
Can Cuckoo Catfish and Rummy-Nose Tetra live together?
No. This combination is not recommended. Key incompatibilities — such as critical behavioural conflicts — make cohabitation unsafe.
What size tank do Cuckoo Catfish and Rummy-Nose Tetra need?
A minimum of 340 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 Cuckoo Catfish and Rummy-Nose Tetra together?
Keep the aquarium between 24°C and 28°C. A target of around 26.0°C sits comfortably within both species' preferred ranges.
Are Cuckoo Catfish or Rummy-Nose Tetra aggressive?
Cuckoo Catfish is moderately assertive (5/10) and Rummy-Nose Tetra is peaceful (1/10). The gap in aggression levels means the calmer fish may experience stress from the more assertive one.
What pH do Cuckoo Catfish and Rummy-Nose Tetra need?
Their pH requirements do not overlap. Cuckoo Catfish prefers 7.5–9, while Rummy-Nose Tetra needs 5.5–7. This makes them incompatible in the same water chemistry.
Does Cuckoo Catfish being nocturnal affect compatibility?
Cuckoo 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 Cuckoo Catfish during evening hours.
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