Can Azureus Cichlid and Penguin Tetra Live Together?
Azureus Cichlid and Penguin Tetra 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 Azureus Cichlid and Penguin Tetra?
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
Azureus Cichlid is a moderately assertive species (5/10), while Penguin Tetra is peaceful (2/10). This modest difference means Azureus Cichlid may occasionally assert dominance over Penguin Tetra.
Azureus Cichlid and Penguin Tetra both frequent the Middle (Open Water) and Top (Surface) region of the setup. This overlap can increase competition for space, so providing ample room and cover is important to keep both species comfortable.
Worth noting: Penguin Tetra is a known jumper, so a tight-fitting lid is essential.
Water Parameters
The safe temperature window for both species falls between 23°C and 28°C. Aim for the midpoint of this range (around 25.5°C) for optimal comfort.
The pH requirements of Azureus Cichlid (7.8–8.6) and Penguin Tetra (5.5–7.5) 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 Azureus Cichlid and Penguin Tetra together, plan for an aquarium of at least 200 litres with a minimum length of 120 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), Plants - Densely covered, Plants - Floating. 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
Azureus Cichlid and Penguin Tetra 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 Azureus Cichlid and Penguin Tetra.
55 Gallon Standard
60 Gallon Breeder
75 Gallon Standard
90 Gallon Standard
125 Gallon Standard
150 Gallon High
Frequently Asked Questions
Can Azureus Cichlid and Penguin Tetra live together?
No. This combination is not recommended. Key incompatibilities — such as critical behavioural conflicts — make cohabitation unsafe.
What size tank do Azureus Cichlid and Penguin Tetra need?
A minimum of 200 litres (tank length at least 120 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 Azureus Cichlid and Penguin Tetra together?
Keep the aquarium between 23°C and 28°C. A target of around 25.5°C sits comfortably within both species' preferred ranges.
Are Azureus Cichlid or Penguin Tetra aggressive?
Azureus Cichlid is moderately assertive (5/10) and Penguin Tetra is peaceful (2/10). Their similar temperaments generally lead to a peaceful coexistence.
What pH do Azureus Cichlid and Penguin Tetra need?
Their pH requirements do not overlap. Azureus Cichlid prefers 7.8–8.6, while Penguin Tetra needs 5.5–7.5. This makes them incompatible in the same water chemistry.
Will Penguin Tetra nip Azureus Cichlid's fins?
Penguin Tetra is a known fin nipper. If Azureus Cichlid has long or flowing fins, there is a real risk of fin damage. Keeping Penguin Tetra in a larger group can help redirect nipping behaviour toward conspecifics.
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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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