Can Cuckoo Catfish and Twig Catfish (Farlowella) Live Together?
Cuckoo Catfish and Twig Catfish (Farlowella) 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
Behaviour & Temperament
Cuckoo Catfish is a moderately assertive species (5/10), while Twig Catfish (Farlowella) is peaceful (1/10). This notable difference means Cuckoo Catfish may occasionally assert dominance over Twig Catfish (Farlowella).
Cuckoo Catfish and Twig Catfish (Farlowella) 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 26°C. Aim for the midpoint of this range (around 25.0°C) for optimal comfort.
The pH requirements of Cuckoo Catfish (7.5–9) and Twig Catfish (Farlowella) (6–7.2) do not overlap, making it impossible to satisfy both species simultaneously.
For general hardness, the shared comfort zone is 10–10 dGH. Regular testing will ensure conditions stay within this range. An aquarium test kit is recommended for monitoring.
Tank Setup
To house Cuckoo Catfish and Twig Catfish (Farlowella) together, plan for an aquarium of at least 408 litres with a minimum length of 120 cm. This accounts for the larger species' space requirements with an additional 20 % buffer to reduce territorial tension.
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), Established Algae (Otocinclus). 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.
Find the right tank equipment
Browse tanks, décor, and equipment suited for this setup.
Suitable Tank Sizes
Standard aquarium sizes large enough for both Cuckoo Catfish and Twig Catfish (Farlowella).
90 Gallon Standard
125 Gallon Standard
150 Gallon High
180 Gallon Standard
350 Liter (120cm Deep)
450 Liter (150cm Standard)
Frequently Asked Questions
Can Cuckoo Catfish and Twig Catfish (Farlowella) 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 Twig Catfish (Farlowella) need?
A minimum of 408 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 Twig Catfish (Farlowella) 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 Cuckoo Catfish or Twig Catfish (Farlowella) aggressive?
Cuckoo Catfish is moderately assertive (5/10) and Twig Catfish (Farlowella) 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 Twig Catfish (Farlowella) need?
Their pH requirements do not overlap. Cuckoo Catfish prefers 7.5–9, while Twig Catfish (Farlowella) needs 6–7.2. 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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