Can Freshwater Harlequin Shrimp (Sulawesi) and Snakehead Fighter Live Together?

Freshwater Harlequin Shrimp (Sulawesi) is a peaceful species (0/10), while Snakehead Fighter is peaceful (2/10). This modest difference means Snakehead Fighter may occasionally assert dominance over Freshwater Harlequin Shrimp (Sulawesi).

Freshwater Harlequin Shrimp (Sulawesi) and Snakehead Fighter 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.

Worth noting: Freshwater Harlequin Shrimp (Sulawesi) is nocturnal and will be most active after lights-out, naturally reducing daytime encounters. Also, Snakehead Fighter is a known jumper, so a tight-fitting lid is essential.

The safe temperature window for both species falls between 26°C and 28°C. Aim for the midpoint of this range (around 27.0°C) for optimal comfort.

The pH requirements of Freshwater Harlequin Shrimp (Sulawesi) (7.5–8.5) and Snakehead Fighter (4–6.5) do not overlap, making it impossible to satisfy both species simultaneously.

For general hardness, the shared comfort zone is 4–5 dGH. Regular testing will ensure conditions stay within this range.

To house Freshwater Harlequin Shrimp (Sulawesi) and Snakehead Fighter together, plan for an aquarium of at least 38 litres with a minimum length of 45 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: Established Algae (Otocinclus), Smooth Gravel (Sensitive Barbels), Leaf Litter/Blackwater, Plants - Densely covered, Plants - Floating. Meeting these requirements will help both species thrive.

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

Freshwater Harlequin Shrimp (Sulawesi) and Snakehead Fighter 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.