Can Gertrude's Spotted Blue-eye and Malawi Hawk Live Together?
Gertrude's Spotted Blue-eye and Malawi Hawk are not recommended as tank mates due to conflicting pH requirements and piscivorous fish will prey on nano-sized tank mates.. 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 Gertrude's Spotted Blue-eye and Malawi Hawk?
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.
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Behaviour & Temperament
Gertrude's Spotted Blue-eye is a peaceful species (2/10), while Malawi Hawk is semi-aggressive (7/10). This notable difference means Malawi Hawk may occasionally assert dominance over Gertrude's Spotted Blue-eye.
Gertrude's Spotted Blue-eye and Malawi Hawk both frequent the Top (Surface) and Middle (Open Water) region of the setup. This overlap can increase competition for space, so providing ample room and cover is important to keep both species comfortable.
There is a critical concern: the Nano / Bite-sized (Predation Risk) behaviour of one fish directly conflicts with the Piscivore (Eats small/nano fish) trait of the other — piscivorous fish will prey on nano-sized tank mates..
Worth noting: Gertrude's Spotted Blue-eye 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 Gertrude's Spotted Blue-eye (6–7.5) and Malawi Hawk (7.8–8.6) 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.
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Tank Setup
To house Gertrude's Spotted Blue-eye and Malawi Hawk together, plan for an aquarium of at least 475 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: Plants - Densely covered, Plants - Floating, Leaf Litter/Blackwater, Sand (Sifters). 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.
Suitable Tank Sizes
Standard aquarium sizes large enough for both Gertrude's Spotted Blue-eye and Malawi Hawk.
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Frequently Asked Questions
Can Gertrude's Spotted Blue-eye and Malawi Hawk live together?
No. This combination is not recommended. Key incompatibilities — such as critical behavioural conflicts — make cohabitation unsafe.
What size tank do Gertrude's Spotted Blue-eye and Malawi Hawk need?
A minimum of 475 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 Gertrude's Spotted Blue-eye and Malawi Hawk 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 Gertrude's Spotted Blue-eye or Malawi Hawk aggressive?
Gertrude's Spotted Blue-eye is peaceful (2/10) and Malawi Hawk 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 Gertrude's Spotted Blue-eye and Malawi Hawk need?
Their pH requirements do not overlap. Gertrude's Spotted Blue-eye prefers 6–7.5, while Malawi Hawk needs 7.8–8.6. This makes them incompatible in the same water chemistry.
How do I manage Malawi Hawk's territorial behaviour?
Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives Malawi Hawk 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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