Can Arrowhead Puffer and Keyhole Cichlid Live Together?
Keeping Arrowhead Puffer and Keyhole Cichlid together is possible but requires caution due to differing aggression levels and potential behavioral clashes. Provide a spacious tank of at least 114 litres with plenty of hiding spots to reduce stress. Monitor behaviour closely, especially during the first few weeks.
At a Glance
Can your tank handle Arrowhead Puffer and Keyhole 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.
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Behaviour & Temperament
Arrowhead Puffer is a highly aggressive species (10/10), while Keyhole Cichlid is peaceful (2/10). This notable difference means Arrowhead Puffer may occasionally assert dominance over Keyhole Cichlid.
Large aggression gap (8 points) between Arrowhead Puffer and Keyhole Cichlid increases stress risk for the more peaceful fish.
Arrowhead Puffer and Keyhole Cichlid 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: Aggressive fish may bully and stress shy, slow-moving species.
To improve the chances of a peaceful coexistence in this community tank: A larger aquarium with ample hiding spots can help diffuse aggression and give the less dominant fish space to retreat.
Water Parameters
The safe temperature window for both species falls between 22°C and 28°C. Aim for the midpoint of this range (around 25.0°C) for optimal comfort.
Both fish can tolerate a pH between 6.5 and 7.5. Maintaining a stable value within this band is more important than hitting an exact number.
For general hardness, the shared comfort zone is 5–15 dGH. Regular testing will ensure conditions stay within this range.
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Tank Setup
To house Arrowhead Puffer and Keyhole Cichlid together, plan for an aquarium of at least 114 litres with a minimum length of 80 cm. This recommendation combines the stricter species minimums with a community-load allowance so the pairing has realistic long-term space and filtration headroom.
Because this pairing requires extra vigilance, include plenty of hiding spots — caves, driftwood, and dense plant clusters — so the less dominant fish can retreat when needed.
Specific environmental needs for this combination include: Sand (Sifters), Driftwood (Digestion/Hiding), Plants - Densely covered, Leaf Litter/Blackwater. 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 Arrowhead Puffer and Keyhole Cichlid.
30 Gallon Breeder
40 Gallon Breeder
55 Gallon Standard
60 Gallon Breeder
75 Gallon Standard
90 Gallon Standard
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Frequently Asked Questions
Can Arrowhead Puffer and Keyhole Cichlid live together?
They can coexist, but the pairing requires careful monitoring. Provide ample space (at least 114 litres), plenty of hiding spots, and watch for signs of stress or aggression.
What size tank do Arrowhead Puffer and Keyhole Cichlid need?
A minimum of 114 litres (tank length at least 80 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 Arrowhead Puffer and Keyhole Cichlid together?
Keep the aquarium between 22°C and 28°C. A target of around 25.0°C sits comfortably within both species' preferred ranges.
Are Arrowhead Puffer or Keyhole Cichlid aggressive?
Arrowhead Puffer is highly aggressive (10/10) and Keyhole Cichlid is peaceful (2/10). The gap in aggression levels means the calmer fish may experience stress from the more assertive one.
What pH do Arrowhead Puffer and Keyhole Cichlid need?
Both species overlap in the 6.5–7.5 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.
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