Can Keyhole Cichlid and Rummy-Nose Tetra Live Together?
Keeping Keyhole Cichlid and Rummy-Nose Tetra together is possible but requires caution due to potential behavioral clashes. Provide a spacious tank of at least 132 litres with plenty of hiding spots to reduce stress. Monitor behaviour closely, especially during the first few weeks.
At a Glance
Behaviour & Temperament
Keyhole Cichlid is a peaceful species (2/10), while Rummy-Nose Tetra is peaceful (1/10). This modest difference means Keyhole Cichlid may occasionally assert dominance over Rummy-Nose Tetra.
Keyhole Cichlid and Rummy-Nose Tetra both frequent the Middle (Open Water) and 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: Hyperactive swimmers can stress shy, slow-moving species through constant motion.
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 24°C and 28°C. Aim for the midpoint of this range (around 26.0°C) for optimal comfort.
Both fish can tolerate a pH between 6 and 7. Maintaining a stable value within this band is more important than hitting an exact number.
For general hardness, the shared comfort zone is 2–12 dGH. Regular testing will ensure conditions stay within this range. An aquarium test kit is recommended for monitoring.
Tank Setup
To house Keyhole Cichlid and Rummy-Nose Tetra together, plan for an aquarium of at least 132 litres with a minimum length of 80 cm. This accounts for the larger species' space requirements with an additional 20 % buffer to reduce territorial tension.
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: Driftwood (Digestion/Hiding), Plants - Densely covered, Leaf Litter/Blackwater, Plants - lighly covered. Meeting these requirements will help both species thrive.
Both species do well with low (still water) water movement, so a standard filtration setup rated for the tank volume should suffice.
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Frequently Asked Questions
Can Keyhole Cichlid and Rummy-Nose Tetra live together?▾
They can coexist, but the pairing requires careful monitoring. Provide ample space (at least 132 litres), plenty of hiding spots, and watch for signs of stress or aggression.
What size tank do Keyhole Cichlid and Rummy-Nose Tetra need?▾
A minimum of 132 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 Keyhole Cichlid and Rummy-Nose Tetra 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 Keyhole Cichlid or Rummy-Nose Tetra aggressive?▾
Keyhole Cichlid is peaceful (2/10) and Rummy-Nose Tetra is peaceful (1/10). Their similar temperaments generally lead to a peaceful coexistence.
What pH do Keyhole Cichlid and Rummy-Nose Tetra need?▾
Both species overlap in the 6–7 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.
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