Can Denison Barb (Roseline Shark) and Licorice Gourami Live Together?

Denison Barb (Roseline Shark) is a generally mild-mannered species (3/10), while Licorice Gourami is peaceful (2/10). This modest difference means Denison Barb (Roseline Shark) may occasionally assert dominance over Licorice Gourami.

Denison Barb (Roseline Shark) and Licorice Gourami both frequent the Middle (Open Water) and 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: Hyperactive swimmers can stress shy, slow-moving species through constant motion. Aggressive eaters may outcompete shy fish for food, leading to malnutrition.

Worth noting: Denison Barb (Roseline Shark) is a known jumper, so a tight-fitting lid is essential.

The safe temperature window for both species falls between 22°C and 26°C. Aim for the midpoint of this range (around 24.0°C) for optimal comfort.

The pH requirements of Denison Barb (Roseline Shark) (6.5–7.8) and Licorice Gourami (3–6) do not overlap, making it impossible to satisfy both species simultaneously.

Hardness requirements are incompatible: Denison Barb (Roseline Shark) needs 5–25 dGH while Licorice Gourami requires 0–4 dGH.

To house Denison Barb (Roseline Shark) and Licorice Gourami 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: Plants - Densely covered, Driftwood (Digestion/Hiding), Smooth Gravel (Sensitive Barbels), Leaf Litter/Blackwater, Plants - Floating. Meeting these requirements will help both species thrive.

Note a potential conflict in setup requirements: Denison Barb (Roseline Shark) is a plant destroyer, which conflicts with Licorice Gourami's requirement for live plants. Compromise where possible or prioritise the more critical need.

Denison Barb (Roseline Shark) prefers High (River/Stream) flow while Licorice Gourami needs Low (Still Water) flow. Consider positioning filter outlets and using baffles to create zones of different current intensity within the same tank.

Denison Barb (Roseline Shark) and Licorice Gourami 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. Denison Barb (Roseline Shark) is an aggressive eater that may prevent Licorice Gourami from getting enough food.

Because Denison Barb (Roseline Shark) is a fast, competitive feeder, consider using sinking pellets or feeding at opposite ends of the setup to ensure Licorice Gourami receives an adequate share.