Can Chocolate Gourami and Sentani Rainbowfish Live Together?

Chocolate Gourami is a peaceful species (2/10), while Sentani Rainbowfish is generally mild-mannered (3/10). This modest difference means Sentani Rainbowfish may occasionally assert dominance over Chocolate Gourami.

Chocolate Gourami and Sentani Rainbowfish both frequent the Top (Surface) and 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.

Additional behavioural considerations to keep in mind: Hyperactive swimmers can stress shy, slow-moving species through constant motion. Aggressive eaters may outcompete shy fish for food, leading to malnutrition.

Worth noting: Sentani Rainbowfish is a known jumper, so a tight-fitting lid is essential.

The safe temperature window for both species falls between 25°C and 29°C. Aim for the midpoint of this range (around 27.0°C) for optimal comfort.

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

Hardness requirements are incompatible: Chocolate Gourami needs 0–5 dGH while Sentani Rainbowfish requires 8–15 dGH.

To house Chocolate Gourami and Sentani Rainbowfish together, plan for an aquarium of at least 200 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: Leaf Litter/Blackwater, Plants - Densely covered, Plants - Floating, Driftwood (Digestion/Hiding). 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.

Chocolate Gourami and Sentani Rainbowfish 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.

Feeding time deserves special attention with this pairing. Sentani Rainbowfish is an aggressive eater that may prevent Chocolate Gourami from getting enough food.

Because Sentani Rainbowfish is a fast, competitive feeder, consider using sinking pellets or feeding at opposite ends of the setup to ensure Chocolate Gourami receives an adequate share.