Can Amazon Leaf Fish and Flowerhorn Cichlid Live Together?
Amazon Leaf Fish and Flowerhorn Cichlid are not recommended as tank mates due to conflicting pH requirements and incompatible hardness ranges. 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
Amazon Leaf Fish is a peaceful species (2/10), while Flowerhorn Cichlid is highly aggressive (10/10). This notable difference means Flowerhorn Cichlid may occasionally assert dominance over Amazon Leaf Fish.
Large aggression gap (8 points) between Amazon Leaf Fish and Flowerhorn Cichlid increases stress risk for the more peaceful fish.
Amazon Leaf Fish and Flowerhorn Cichlid 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.
Worth noting: Amazon Leaf Fish is nocturnal and will be most active after lights-out, naturally reducing daytime encounters.
Water Parameters
The safe temperature window for both species falls between 26°C and 29°C. Aim for the midpoint of this range (around 27.5°C) for optimal comfort.
The pH requirements of Amazon Leaf Fish (5–6.8) and Flowerhorn Cichlid (7.4–8) do not overlap, making it impossible to satisfy both species simultaneously.
Hardness requirements are incompatible: Amazon Leaf Fish needs 0–8 dGH while Flowerhorn Cichlid requires 9–20 dGH. An aquarium test kit is recommended for monitoring.
Tank Setup
To house Amazon Leaf Fish and Flowerhorn Cichlid together, plan for an aquarium of at least 336 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, Plants - Densely covered, Driftwood (Digestion/Hiding), Plants - Floating, Sand (Sifters), Smooth Gravel (Sensitive Barbels). Meeting these requirements will help both species thrive.
Note a potential conflict in setup requirements: Flowerhorn Cichlid is a plant destroyer, which conflicts with Amazon Leaf 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.
Suitable Tank Sizes
Standard aquarium sizes large enough for both Amazon Leaf Fish and Flowerhorn Cichlid.
75 Gallon Standard
90 Gallon Standard
125 Gallon Standard
150 Gallon High
180 Gallon Standard
350 Liter (120cm Deep)
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Frequently Asked Questions
Can Amazon Leaf Fish and Flowerhorn Cichlid live together?
No. This combination is not recommended. Key incompatibilities — such as critical behavioural conflicts — make cohabitation unsafe.
What size tank do Amazon Leaf Fish and Flowerhorn Cichlid need?
A minimum of 336 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 Amazon Leaf Fish and Flowerhorn Cichlid together?
Keep the aquarium between 26°C and 29°C. A target of around 27.5°C sits comfortably within both species' preferred ranges.
Are Amazon Leaf Fish or Flowerhorn Cichlid aggressive?
Amazon Leaf Fish is peaceful (2/10) and Flowerhorn Cichlid is highly aggressive (10/10). The gap in aggression levels means the calmer fish may experience stress from the more assertive one.
What pH do Amazon Leaf Fish and Flowerhorn Cichlid need?
Their pH requirements do not overlap. Amazon Leaf Fish prefers 5–6.8, while Flowerhorn Cichlid needs 7.4–8. This makes them incompatible in the same water chemistry.
How do I manage Flowerhorn Cichlid's territorial behaviour?
Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives Flowerhorn Cichlid 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.
Does Amazon Leaf Fish being nocturnal affect compatibility?
Amazon Leaf Fish is most active after lights-out, which naturally reduces daytime encounters with its tank mate. This can actually be beneficial, as both fish get undisturbed time to feed and explore. Just ensure food reaches Amazon Leaf Fish during evening hours.
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