Can Flowerhorn Cichlid and Twig Catfish (Farlowella) Live Together?

Flowerhorn Cichlid is a highly aggressive species (10/10), while Twig Catfish (Farlowella) is peaceful (1/10). This notable difference means Flowerhorn Cichlid may occasionally assert dominance over Twig Catfish (Farlowella).

Large aggression gap (9 points) between Flowerhorn Cichlid and Twig Catfish (Farlowella) increases stress risk for the more peaceful fish.

Flowerhorn Cichlid and Twig Catfish (Farlowella) 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.

The safe temperature window for both species falls between 26°C and 26°C. Aim for the midpoint of this range (around 26.0°C) for optimal comfort.

The pH requirements of Flowerhorn Cichlid (7.4–8) and Twig Catfish (Farlowella) (6–7.2) do not overlap, making it impossible to satisfy both species simultaneously.

For general hardness, the shared comfort zone is 9–10 dGH. Regular testing will ensure conditions stay within this range.

To house Flowerhorn Cichlid and Twig Catfish (Farlowella) 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), Driftwood (Digestion/Hiding), Established Algae (Otocinclus). Meeting these requirements will help both species thrive.

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

Flowerhorn Cichlid and Twig Catfish (Farlowella) 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.