Can Cardinal Tetra and Jack Dempsey Live Together?
Cardinal Tetra and Jack Dempsey are not recommended as tank mates due to 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
Behaviour & Temperament
Cardinal Tetra is a peaceful species (1/10), while Jack Dempsey is semi-aggressive (8/10). This notable difference means Jack Dempsey may occasionally assert dominance over Cardinal Tetra.
Large aggression gap (7 points) between Cardinal Tetra and Jack Dempsey increases stress risk for the more peaceful fish.
Cardinal Tetra and Jack Dempsey both frequent the 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..
Additional behavioural considerations to keep in mind: Aggressive fish may bully and stress shy, slow-moving species.
Water Parameters
The safe temperature window for both species falls between 24°C and 29°C. Aim for the midpoint of this range (around 26.5°C) for optimal comfort.
Both fish can tolerate a pH between 6.5 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 5–8 dGH. Regular testing will ensure conditions stay within this range.
Tank Setup
To house Cardinal Tetra and Jack Dempsey together, plan for an aquarium of at least 240 litres with a minimum length of 120 cm. This accounts for the larger species' space requirements with an additional 20 % buffer to reduce territorial tension.
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: Leaf Litter/Blackwater, Driftwood (Digestion/Hiding), Plants - Densely covered, Sand (Sifters), Smooth Gravel (Sensitive Barbels). Meeting these requirements will help both species thrive.
Note a potential conflict in setup requirements: Jack Dempsey is a plant destroyer, which conflicts with Cardinal Tetra's requirement for live plants. Compromise where possible or prioritise the more critical need.
Both species do well with low (still water) water movement, so a standard filtration setup rated for the tank volume should suffice.
Frequently Asked Questions
Can Cardinal Tetra and Jack Dempsey live together?▾
No. This combination is not recommended. Key incompatibilities — such as critical behavioural conflicts — make cohabitation unsafe.
What size tank do Cardinal Tetra and Jack Dempsey need?▾
A minimum of 240 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 Cardinal Tetra and Jack Dempsey together?▾
Keep the aquarium between 24°C and 29°C. A target of around 26.5°C sits comfortably within both species' preferred ranges.
Are Cardinal Tetra or Jack Dempsey aggressive?▾
Cardinal Tetra is peaceful (1/10) and Jack Dempsey is semi-aggressive (8/10). The gap in aggression levels means the calmer fish may experience stress from the more assertive one.
What pH do Cardinal Tetra and Jack Dempsey need?▾
Both species overlap in the 6.5–7 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.
How do I manage Jack Dempsey's territorial behaviour?▾
Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives Jack Dempsey 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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