Can Paradise Fish and Uaru Live Together?
Paradise Fish and Uaru are not recommended as tank mates due to no temperature overlap. 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
Paradise Fish is a semi-aggressive species (8/10), while Uaru is generally mild-mannered (4/10). This notable difference means Paradise Fish may occasionally assert dominance over Uaru.
Paradise Fish and Uaru 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.
Additional behavioural considerations to keep in mind: Aggressive fish may bully and stress shy, slow-moving species. Hyperactive swimmers can stress shy, slow-moving species through constant motion.
Worth noting: Paradise Fish is a known jumper, so a tight-fitting lid is essential.
Water Parameters
There is no temperature overlap between Paradise Fish (16–26°C) and Uaru (27–30°C). This fundamental mismatch makes long-term cohabitation impractical.
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 5–8 dGH. Regular testing will ensure conditions stay within this range. An aquarium test kit is recommended for monitoring.
Tank Setup
To house Paradise Fish and Uaru together, plan for an aquarium of at least 480 litres with a minimum length of 150 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: Plants - Densely covered, Plants - Floating, Driftwood (Digestion/Hiding), Sand (Sifters). Meeting these requirements will help both species thrive.
Note a potential conflict in setup requirements: Uaru is a plant destroyer, which conflicts with Paradise Fish'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.
Find the right tank equipment
Browse tanks, décor, and equipment suited for this setup.
Frequently Asked Questions
Can Paradise Fish and Uaru live together?▾
No. This combination is not recommended. Key incompatibilities — such as non-overlapping temperature ranges — make cohabitation unsafe.
What size tank do Paradise Fish and Uaru need?▾
A minimum of 480 litres (tank length at least 150 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 Paradise Fish and Uaru together?▾
Unfortunately, there is no temperature range that satisfies both species. Paradise Fish requires 16–26°C, while Uaru needs 27–30°C.
Are Paradise Fish or Uaru aggressive?▾
Paradise Fish is semi-aggressive (8/10) and Uaru is generally mild-mannered (4/10). The gap in aggression levels means the calmer fish may experience stress from the more assertive one.
What pH do Paradise Fish and Uaru need?▾
Both species overlap in the 6–7 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.
Will Paradise Fish nip Uaru's fins?▾
Paradise Fish is a known fin nipper. If Uaru has long or flowing fins, there is a real risk of fin damage. Keeping Paradise Fish in a larger group can help redirect nipping behaviour toward conspecifics.
How do I manage Paradise Fish's territorial behaviour?▾
Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives Paradise Fish 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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