Can Beckford's Pencilfish and Spotfin Goby Cichlid Live Together?
Beckford's Pencilfish and Spotfin Goby Cichlid 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 Spotfin Goby Cichlid?
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 Spotfin Goby Cichlid is moderately assertive (6/10). This notable difference means Spotfin Goby Cichlid 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 Spotfin Goby Cichlid 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 27°C. Aim for the midpoint of this range (around 25.5°C) for optimal comfort.
The pH requirements of Beckford's Pencilfish (5–7.5) and Spotfin Goby Cichlid (8–9) 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 Spotfin Goby Cichlid together, plan for an aquarium of at least 75 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: Plants - Densely covered, Plants - Floating, Leaf Litter/Blackwater, Sand (Sifters), Smooth Gravel (Sensitive Barbels). Meeting these requirements will help both species thrive.
Beckford's Pencilfish prefers Low (Still Water) flow while Spotfin Goby Cichlid 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 Spotfin Goby Cichlid 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 Spotfin Goby Cichlid.
20 Gallon High
20 Gallon Long
29 Gallon Standard
30 Gallon Breeder
36 Gallon Bowfront
40 Gallon Breeder
Show 17 more tank sizes
Frequently Asked Questions
Can Beckford's Pencilfish and Spotfin Goby Cichlid 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 Spotfin Goby Cichlid need?
A minimum of 75 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 Beckford's Pencilfish and Spotfin Goby Cichlid 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 Beckford's Pencilfish or Spotfin Goby Cichlid aggressive?
Beckford's Pencilfish is peaceful (2/10) and Spotfin Goby Cichlid is moderately assertive (6/10). The gap in aggression levels means the calmer fish may experience stress from the more assertive one.
What pH do Beckford's Pencilfish and Spotfin Goby Cichlid need?
Their pH requirements do not overlap. Beckford's Pencilfish prefers 5–7.5, while Spotfin Goby Cichlid needs 8–9. This makes them incompatible in the same water chemistry.
How do I manage Spotfin Goby Cichlid's territorial behaviour?
Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives Spotfin Goby Cichlid 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 11, 2026
- Last updated
- May 11, 2026
- Issues or corrections?
- Contact the editorial team
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