Can Apistogramma Black-Chin and Least Killifish (Heterandria) Live Together?
Apistogramma Black-Chin and Least Killifish (Heterandria) 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 Apistogramma Black-Chin and Least Killifish (Heterandria)?
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 Black-Chin is a moderately assertive species (6/10), while Least Killifish (Heterandria) is peaceful (1/10). This notable difference means Apistogramma Black-Chin may occasionally assert dominance over Least Killifish (Heterandria).
Apistogramma Black-Chin and Least Killifish (Heterandria) 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: Shrimp eaters may also prey on very small nano fish.
Water Parameters
The safe temperature window for both species falls between 24°C and 27°C. Aim for the midpoint of this range (around 25.5°C) for optimal comfort.
The pH requirements of Apistogramma Black-Chin (4.5–6.5) and Least Killifish (Heterandria) (7–8) do not overlap, making it impossible to satisfy both species simultaneously.
For general hardness, the shared comfort zone is 5–5 dGH. Regular testing will ensure conditions stay within this range.
Tank Setup
To house Apistogramma Black-Chin and Least Killifish (Heterandria) together, plan for an aquarium of at least 60 litres with a minimum length of 60 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, Plants - Floating. 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 Black-Chin and Least Killifish (Heterandria) 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 Black-Chin and Least Killifish (Heterandria).
20 Gallon High
20 Gallon Long
29 Gallon Standard
30 Gallon Breeder
36 Gallon Bowfront
40 Gallon Breeder
Show 19 more tank sizes
Diet & Feeding
Feeding time deserves special attention with this pairing. Apistogramma Black-Chin is a known shrimp eater and may prey on small invertebrates or nano fish like Least Killifish (Heterandria).
Frequently Asked Questions
Can Apistogramma Black-Chin and Least Killifish (Heterandria) live together?
No. This combination is not recommended. Key incompatibilities — such as critical behavioural conflicts — make cohabitation unsafe.
What size tank do Apistogramma Black-Chin and Least Killifish (Heterandria) need?
A minimum of 60 litres (tank length at least 60 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 Black-Chin and Least Killifish (Heterandria) together?
Keep the aquarium between 24°C and 27°C. A target of around 25.5°C sits comfortably within both species' preferred ranges.
Are Apistogramma Black-Chin or Least Killifish (Heterandria) aggressive?
Apistogramma Black-Chin is moderately assertive (6/10) and Least Killifish (Heterandria) is peaceful (1/10). The gap in aggression levels means the calmer fish may experience stress from the more assertive one.
What pH do Apistogramma Black-Chin and Least Killifish (Heterandria) need?
Their pH requirements do not overlap. Apistogramma Black-Chin prefers 4.5–6.5, while Least Killifish (Heterandria) needs 7–8. This makes them incompatible in the same water chemistry.
How do I manage Apistogramma Black-Chin's territorial behaviour?
Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives Apistogramma Black-Chin 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.
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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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