Can Beckford's Pencilfish and Tanganyikan Clown Cichlid (Eretmodus) Live Together?
Beckford's Pencilfish and Tanganyikan Clown Cichlid (Eretmodus) 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 Beckford's Pencilfish and Tanganyikan Clown Cichlid (Eretmodus)?
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
Beckford's Pencilfish is a peaceful species (2/10), while Tanganyikan Clown Cichlid (Eretmodus) is semi-aggressive (7/10). This notable difference means Tanganyikan Clown Cichlid (Eretmodus) may occasionally assert dominance over Beckford's Pencilfish.
In terms of spatial distribution, Beckford's Pencilfish prefers the Top (Surface) and Middle (Open Water) zones, whereas Tanganyikan Clown Cichlid (Eretmodus) occupies the Bottom (Substrate) zone. Because they use different levels of the water column, territorial disputes are less likely and the tank will appear more balanced.
Worth noting: Beckford's Pencilfish is a known jumper, so a tight-fitting lid is essential.
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 Beckford's Pencilfish (5–7.5) and Tanganyikan Clown Cichlid (Eretmodus) (8–9.5) do not overlap, making it impossible to satisfy both species simultaneously.
For general hardness, the shared comfort zone is 10–15 dGH. Regular testing will ensure conditions stay within this range.
Tank Setup
To house Beckford's Pencilfish and Tanganyikan Clown Cichlid (Eretmodus) together, plan for an aquarium of at least 100 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: Plants - Densely covered, Plants - Floating, Leaf Litter/Blackwater, Smooth Gravel (Sensitive Barbels), Established Algae (Otocinclus). Meeting these requirements will help both species thrive.
Beckford's Pencilfish prefers Low (Still Water) flow while Tanganyikan Clown Cichlid (Eretmodus) needs High (River/Stream) flow. Consider positioning filter outlets and using baffles to create zones of different current intensity within the same tank.
Why This Pairing Usually Fails in Practice
Beckford's Pencilfish and Tanganyikan Clown Cichlid (Eretmodus) 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 Beckford's Pencilfish and Tanganyikan Clown Cichlid (Eretmodus).
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 Beckford's Pencilfish and Tanganyikan Clown Cichlid (Eretmodus) live together?
No. This combination is not recommended. Key incompatibilities — such as critical behavioural conflicts — make cohabitation unsafe.
What size tank do Beckford's Pencilfish and Tanganyikan Clown Cichlid (Eretmodus) need?
A minimum of 100 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 Beckford's Pencilfish and Tanganyikan Clown Cichlid (Eretmodus) 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 Beckford's Pencilfish or Tanganyikan Clown Cichlid (Eretmodus) aggressive?
Beckford's Pencilfish is peaceful (2/10) and Tanganyikan Clown Cichlid (Eretmodus) is semi-aggressive (7/10). The gap in aggression levels means the calmer fish may experience stress from the more assertive one.
What pH do Beckford's Pencilfish and Tanganyikan Clown Cichlid (Eretmodus) need?
Their pH requirements do not overlap. Beckford's Pencilfish prefers 5–7.5, while Tanganyikan Clown Cichlid (Eretmodus) needs 8–9.5. This makes them incompatible in the same water chemistry.
How do I manage Tanganyikan Clown Cichlid (Eretmodus)'s territorial behaviour?
Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives Tanganyikan Clown Cichlid (Eretmodus) 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 4, 2026
- Last updated
- May 4, 2026
- Issues or corrections?
- Contact the editorial team
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