Can Flag Tetra and Haplochromis sp. 44 (Thick Skin) Live Together?

Flag Tetra is a peaceful species (1/10), while Haplochromis sp. 44 (Thick Skin) is semi-aggressive (8/10). This notable difference means Haplochromis sp. 44 (Thick Skin) may occasionally assert dominance over Flag Tetra.

Large aggression gap (7 points) between Flag Tetra and Haplochromis sp. 44 (Thick Skin) increases stress risk for the more peaceful fish.

Flag Tetra and Haplochromis sp. 44 (Thick Skin) 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.

To improve the chances of a peaceful coexistence in this community tank: Provide a significantly larger tank (at least 50% more volume than the minimum) to allow both Flag Tetra and Haplochromis sp. 44 (Thick Skin) to establish separate territories. Add plenty of line-of-sight breaks using driftwood, rocks, and dense planting to reduce territorial confrontations. A larger aquarium with ample hiding spots can help diffuse aggression and give the less dominant fish space to retreat.

The safe temperature window for both species falls between 23°C and 28°C. Aim for the midpoint of this range (around 25.5°C) for optimal comfort.

Both fish can tolerate a pH between 7.5 and 7.5. Maintaining a stable value within this band is more important than hitting an exact number.

For general hardness, the shared comfort zone is 10–12 dGH. Regular testing will ensure conditions stay within this range.

To house Flag Tetra and Haplochromis sp. 44 (Thick Skin) together, plan for an aquarium of at least 252 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.

Because this pairing requires extra vigilance, include plenty of hiding spots — caves, driftwood, and dense plant clusters — so the less dominant fish can retreat when needed.

Specific environmental needs for this combination include: Plants - Densely covered, Leaf Litter/Blackwater, Sand (Sifters). Meeting these requirements will help both species thrive.

Note a potential conflict in setup requirements: Haplochromis sp. 44 (Thick Skin) is a plant destroyer, which conflicts with Flag Tetra'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.

This pairing usually fails when the tank is treated like a standard mixed community and the caution flags are ignored. Flag Tetra and Haplochromis sp. 44 (Thick Skin) need extra room, more cover, and closer observation during the first few weeks so small aggression, feeding, or territory issues do not snowball into a long-term problem.