Can Apistogramma uaupesi and Tandanus Catfish Live Together?
Apistogramma uaupesi and Tandanus Catfish are not recommended as tank mates due to conflicting pH requirements and incompatible hardness ranges. 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 Apistogramma uaupesi and Tandanus 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.
Behaviour & Temperament
Apistogramma uaupesi is a moderately assertive species (5/10), while Tandanus Catfish is generally mild-mannered (4/10). This modest difference means Apistogramma uaupesi may occasionally assert dominance over Tandanus Catfish.
Apistogramma uaupesi and Tandanus Catfish both frequent the 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.
Worth noting: Tandanus 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 Apistogramma uaupesi (4–6) and Tandanus Catfish (6.5–8) do not overlap, making it impossible to satisfy both species simultaneously.
Hardness requirements are incompatible: Apistogramma uaupesi needs 0–5 dGH while Tandanus Catfish requires 8–18 dGH.
Tank Setup
To house Apistogramma uaupesi and Tandanus Catfish together, plan for an aquarium of at least 500 litres with a minimum length of 180 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), Leaf Litter/Blackwater, Driftwood (Digestion/Hiding), Plants - Densely covered, Smooth Gravel (Sensitive Barbels). 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.
Why This Pairing Usually Fails in Practice
Apistogramma uaupesi and Tandanus Catfish are the kind of pair that can look acceptable in a shop but become a maintenance problem at home. The main risk is not a single number in the chart; it is the way incompatible behavior, water needs, or pressure on space compounds over time once both fish are established in the same tank.
Suitable Tank Sizes
Standard aquarium sizes large enough for both Apistogramma uaupesi and Tandanus Catfish.
Frequently Asked Questions
Can Apistogramma uaupesi and Tandanus Catfish live together?
No. This combination is not recommended. Key incompatibilities — such as critical behavioural conflicts — make cohabitation unsafe.
What size tank do Apistogramma uaupesi and Tandanus Catfish need?
A minimum of 500 litres (tank length at least 180 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 Apistogramma uaupesi and Tandanus Catfish 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 Apistogramma uaupesi or Tandanus Catfish aggressive?
Apistogramma uaupesi is moderately assertive (5/10) and Tandanus Catfish is generally mild-mannered (4/10). Their similar temperaments generally lead to a peaceful coexistence.
What pH do Apistogramma uaupesi and Tandanus Catfish need?
Their pH requirements do not overlap. Apistogramma uaupesi prefers 4–6, while Tandanus Catfish needs 6.5–8. This makes them incompatible in the same water chemistry.
How do I manage Apistogramma uaupesi's territorial behaviour?
Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives Apistogramma uaupesi space to claim a territory without encroaching on the other fish's area. Adding décor that divides the tank into distinct zones works especially well.
Does Tandanus Catfish being nocturnal affect compatibility?
Tandanus 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 Tandanus Catfish during evening hours.
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Guidarium Editorial Desk
Reviewed against Guidarium care, stocking, and compatibility standards. Read the editorial policy.
- Last reviewed
- May 11, 2026
- Last updated
- May 11, 2026
- Issues or corrections?
- Contact the editorial team
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