Can White Cloud Mountain Minnow and White Top Hara (Gallireya Reef) Live Together?

White Cloud Mountain Minnow is a peaceful species (1/10), while White Top Hara (Gallireya Reef) is semi-aggressive (7/10). This notable difference means White Top Hara (Gallireya Reef) may occasionally assert dominance over White Cloud Mountain Minnow.

Large aggression gap (6 points) between White Cloud Mountain Minnow and White Top Hara (Gallireya Reef) increases stress risk for the more peaceful fish.

White Cloud Mountain Minnow and White Top Hara (Gallireya Reef) 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.

Worth noting: White Cloud Mountain Minnow is a known jumper, so a tight-fitting lid is essential.

There is no temperature overlap between White Cloud Mountain Minnow (14–22°C) and White Top Hara (Gallireya Reef) (24–28°C). This fundamental mismatch makes long-term cohabitation impractical.

Both fish can tolerate a pH between 7.8 and 8. 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.

To house White Cloud Mountain Minnow and White Top Hara (Gallireya Reef) together, plan for an aquarium of at least 250 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: Plants - Densely covered, Smooth Gravel (Sensitive Barbels), Sand (Sifters), Established Algae (Otocinclus). Meeting these requirements will help both species thrive.

Note a potential conflict in setup requirements: White Top Hara (Gallireya Reef) is a plant destroyer, which conflicts with White Cloud Mountain Minnow'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.

White Cloud Mountain Minnow 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.