Can Peacock Bass Ocellaris and Spotted Hillstream Loach Live Together?

Peacock Bass Ocellaris is a semi-aggressive species (7/10), while Spotted Hillstream Loach is peaceful (2/10). This notable difference means Peacock Bass Ocellaris may occasionally assert dominance over Spotted Hillstream Loach.

In terms of spatial distribution, Peacock Bass Ocellaris prefers the Middle (Open Water) and Top (Surface) zones, whereas Spotted Hillstream Loach occupies the Bottom (Substrate) zone. Because they use different levels of the water column, territorial disputes are less likely and the tank will appear more balanced.

Additional behavioural considerations to keep in mind: Two territorial species may clash over territory, especially in smaller tanks.

Worth noting: Peacock Bass Ocellaris is a known jumper, so a tight-fitting lid is essential.

There is no temperature overlap between Peacock Bass Ocellaris (25–29°C) and Spotted Hillstream Loach (20–24°C). This fundamental mismatch makes long-term cohabitation impractical.

Both fish can tolerate a pH between 6.5 and 7.5. Maintaining a stable value within this band is more important than hitting an exact number.

For general hardness, the shared comfort zone is 5–12 dGH. Regular testing will ensure conditions stay within this range.

To house Peacock Bass Ocellaris and Spotted Hillstream Loach together, plan for an aquarium of at least 1500 litres with a minimum length of 240 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: Driftwood (Digestion/Hiding), Smooth Gravel (Sensitive Barbels), Established Algae (Otocinclus). 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.

Peacock Bass Ocellaris and Spotted Hillstream Loach 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.