Can Blackline Rasbora and Bumblebee Catfish (South American) Live Together?

Blackline Rasbora is a peaceful species (1/10), while Bumblebee Catfish (South American) is generally mild-mannered (3/10). This modest difference means Bumblebee Catfish (South American) may occasionally assert dominance over Blackline Rasbora.

In terms of spatial distribution, Blackline Rasbora prefers the Middle (Open Water) and Top (Surface) zones, whereas Bumblebee Catfish (South American) 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: Hyperactive swimmers can stress shy, slow-moving species through constant motion. Aggressive eaters may outcompete shy fish for food, leading to malnutrition.

Worth noting: Bumblebee Catfish (South American) is nocturnal and will be most active after lights-out, naturally reducing daytime encounters. Also, Blackline Rasbora is a known jumper, so a tight-fitting lid is essential.

To improve the chances of a peaceful coexistence in this community tank: A larger aquarium with ample hiding spots can help diffuse aggression and give the less dominant fish space to retreat.

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.

Both fish can tolerate a pH between 6 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 4–15 dGH. Regular testing will ensure conditions stay within this range.

To house Blackline Rasbora and Bumblebee Catfish (South American) together, plan for an aquarium of at least 75 litres with a minimum length of 60 cm. This recommendation combines the stricter species minimums with a community-load allowance so the pairing has realistic long-term space and filtration headroom.

Because this pairing requires extra vigilance, include plenty of hiding spots — caves, driftwood, and dense plant clusters — so the less dominant fish can retreat when needed.

Specific environmental needs for this combination include: Plants - Densely covered, Driftwood (Digestion/Hiding), Leaf Litter/Blackwater, 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.

This pairing usually fails when the tank is treated like a standard mixed community and the caution flags are ignored. Blackline Rasbora and Bumblebee Catfish (South American) need extra room, more cover, and closer observation during the first few weeks so small aggression, feeding, or territory issues do not snowball into a long-term problem.

Feeding time deserves special attention with this pairing. Blackline Rasbora is an aggressive eater that may prevent Bumblebee Catfish (South American) from getting enough food.

Because Blackline Rasbora is a fast, competitive feeder, consider using sinking pellets or feeding at opposite ends of the setup to ensure Bumblebee Catfish (South American) receives an adequate share.