Can Altolamprologus Calvus and Apistogramma baenschi (Inca 50) Live Together?
Altolamprologus Calvus and Apistogramma baenschi (Inca 50) 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 Altolamprologus Calvus and Apistogramma baenschi (Inca 50)?
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
Both Altolamprologus Calvus and Apistogramma baenschi (Inca 50) are moderately assertive species with an aggression score of 5/10. Their matching temperaments mean neither fish is likely to dominate the other in a shared aquarium.
Altolamprologus Calvus and Apistogramma baenschi (Inca 50) 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.
Additional behavioural considerations to keep in mind: Two territorial species may clash over territory, especially in smaller tanks.
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 Altolamprologus Calvus (7.8–9) and Apistogramma baenschi (Inca 50) (4–6.5) do not overlap, making it impossible to satisfy both species simultaneously.
Hardness requirements are incompatible: Altolamprologus Calvus needs 10–25 dGH while Apistogramma baenschi (Inca 50) requires 1–5 dGH.
Tank Setup
To house Altolamprologus Calvus and Apistogramma baenschi (Inca 50) together, plan for an aquarium of at least 114 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: Sand (Sifters), Shells (Breeding/Hiding), Leaf Litter/Blackwater, Driftwood (Digestion/Hiding). 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.
Why This Pairing Usually Fails in Practice
Altolamprologus Calvus and Apistogramma baenschi (Inca 50) 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 Altolamprologus Calvus and Apistogramma baenschi (Inca 50).
30 Gallon Breeder
40 Gallon Breeder
55 Gallon Standard
60 Gallon Breeder
75 Gallon Standard
90 Gallon Standard
Show 10 more tank sizes
Frequently Asked Questions
Can Altolamprologus Calvus and Apistogramma baenschi (Inca 50) live together?
No. This combination is not recommended. Key incompatibilities — such as critical behavioural conflicts — make cohabitation unsafe.
What size tank do Altolamprologus Calvus and Apistogramma baenschi (Inca 50) need?
A minimum of 114 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 Altolamprologus Calvus and Apistogramma baenschi (Inca 50) 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 Altolamprologus Calvus or Apistogramma baenschi (Inca 50) aggressive?
Altolamprologus Calvus is moderately assertive (5/10) and Apistogramma baenschi (Inca 50) is moderately assertive (5/10). Their similar temperaments generally lead to a peaceful coexistence.
What pH do Altolamprologus Calvus and Apistogramma baenschi (Inca 50) need?
Their pH requirements do not overlap. Altolamprologus Calvus prefers 7.8–9, while Apistogramma baenschi (Inca 50) needs 4–6.5. This makes them incompatible in the same water chemistry.
How do I manage Altolamprologus Calvus's territorial behaviour?
Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives Altolamprologus Calvus 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.
Shared setup supplies
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Guidarium Editorial Desk
Reviewed against Guidarium care, stocking, and compatibility standards. Read the editorial policy.
- Last reviewed
- May 2, 2026
- Last updated
- May 2, 2026
- Issues or corrections?
- Contact the editorial team
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