Can Flowerhorn Cichlid and Hongsloi Apistogramma Live Together?

Flowerhorn Cichlid is a highly aggressive species (10/10), while Hongsloi Apistogramma is moderately assertive (5/10). This notable difference means Flowerhorn Cichlid may occasionally assert dominance over Hongsloi Apistogramma.

Flowerhorn Cichlid and Hongsloi Apistogramma 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: Aggressive fish may bully and stress shy, slow-moving species. Two territorial species may clash over territory, especially in smaller tanks.

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 Flowerhorn Cichlid (7.4–8) and Hongsloi Apistogramma (5.5–7) do not overlap, making it impossible to satisfy both species simultaneously.

Hardness requirements are incompatible: Flowerhorn Cichlid needs 9–20 dGH while Hongsloi Apistogramma requires 1–8 dGH.

To house Flowerhorn Cichlid and Hongsloi Apistogramma together, plan for an aquarium of at least 280 litres with a minimum length of 120 cm. This recommendation combines the stricter species minimums with a community-load allowance so the pairing has realistic long-term space and filtration headroom.

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: Sand (Sifters), Smooth Gravel (Sensitive Barbels), Leaf Litter/Blackwater, Driftwood (Digestion/Hiding), Plants - Densely covered. Meeting these requirements will help both species thrive.

Note a potential conflict in setup requirements: Flowerhorn Cichlid is a plant destroyer, which conflicts with Hongsloi Apistogramma's requirement for live plants. Compromise where possible or prioritise the more critical need.

Both species do well with moderate (standard) water movement, so a standard filtration setup rated for the tank volume should suffice.

Flowerhorn Cichlid and Hongsloi Apistogramma are the kind of pair that can look acceptable in a shop but become a maintenance problem at home. The main risk is not a single number in the chart; it is the way incompatible behavior, water needs, or pressure on space compounds over time once both fish are established in the same tank.