Can Marlier's Julie and White Cloud Mountain Minnow Live Together?

Marlier's Julie is a moderately assertive species (6/10), while White Cloud Mountain Minnow is peaceful (1/10). This notable difference means Marlier's Julie may occasionally assert dominance over White Cloud Mountain Minnow.

Marlier's Julie and White Cloud Mountain Minnow 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 Marlier's Julie (23–27°C) and White Cloud Mountain Minnow (14–22°C). This fundamental mismatch makes long-term cohabitation impractical.

The pH requirements of Marlier's Julie (8.2–9.3) and White Cloud Mountain Minnow (6–8) do not overlap, making it impossible to satisfy both species simultaneously.

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

To house Marlier's Julie and White Cloud Mountain Minnow together, plan for an aquarium of at least 114 litres with a minimum length of 80 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), Plants - Densely covered, Smooth Gravel (Sensitive Barbels). 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.

Marlier's Julie and White Cloud Mountain Minnow 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.