Can Freshwater Flounder and Haplochromis sp. 44 (Thick Skin) Live Together?

Freshwater Flounder is a peaceful species (2/10), 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 Freshwater Flounder.

Large aggression gap (6 points) between Freshwater Flounder and Haplochromis sp. 44 (Thick Skin) increases stress risk for the more peaceful fish.

Freshwater Flounder and Haplochromis sp. 44 (Thick Skin) both frequent the 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. Hyperactive swimmers can stress shy, slow-moving species through constant motion.

Worth noting: Freshwater Flounder is nocturnal and will be most active after lights-out, naturally reducing daytime encounters.

The safe temperature window for both species falls between 23°C and 26°C. Aim for the midpoint of this range (around 24.5°C) for optimal comfort.

Both fish can tolerate a pH between 7.5 and 8.5. Maintaining a stable value within this band is more important than hitting an exact number.

For general hardness, the shared comfort zone is 10–20 dGH. Regular testing will ensure conditions stay within this range.

Crucially, these species require different water types — one needs freshwater while the other requires brackish conditions. This is a hard barrier to keeping them together.

To house Freshwater Flounder and Haplochromis sp. 44 (Thick Skin) together, plan for an aquarium of at least 268 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). 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.

Freshwater Flounder and Haplochromis sp. 44 (Thick Skin) 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.