Can Harlequin Shark and White Top Hara (Gallireya Reef) Live Together?

Harlequin Shark is a semi-aggressive species (8/10), while White Top Hara (Gallireya Reef) is semi-aggressive (7/10). This modest difference means Harlequin Shark may occasionally assert dominance over White Top Hara (Gallireya Reef).

Both Harlequin Shark and White Top Hara (Gallireya Reef) are highly aggressive, increasing the risk of violent confrontations.

Harlequin Shark and White Top Hara (Gallireya Reef) 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: Two territorial species may clash over territory, especially in smaller tanks. Two aggressive species housed together increases risk of fighting.

The safe temperature window for both species falls between 24°C and 27°C. Aim for the midpoint of this range (around 25.5°C) for optimal comfort.

The pH requirements of Harlequin Shark (6–7.5) and White Top Hara (Gallireya Reef) (7.8–8.6) do not overlap, making it impossible to satisfy both species simultaneously.

For general hardness, the shared comfort zone is 10–15 dGH. Regular testing will ensure conditions stay within this range.

To house Harlequin Shark and White Top Hara (Gallireya Reef) 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), Driftwood (Digestion/Hiding), Established Algae (Otocinclus). Meeting these requirements will help both species thrive.

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

Harlequin Shark and White Top Hara (Gallireya Reef) 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.