Can Brown Bullhead Catfish and Celestial Pearl Danio (Galaxy Rasbora) Live Together?

Brown Bullhead Catfish is a moderately assertive species (6/10), while Celestial Pearl Danio (Galaxy Rasbora) is peaceful (2/10). This notable difference means Brown Bullhead Catfish may occasionally assert dominance over Celestial Pearl Danio (Galaxy Rasbora).

Brown Bullhead Catfish and Celestial Pearl Danio (Galaxy Rasbora) both frequent the 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.

There is a critical concern: the Piscivore (Eats small/nano fish) behaviour of one fish directly conflicts with the Nano / Bite-sized (Predation Risk) trait of the other — piscivorous fish will prey on nano-sized tank mates..

Additional behavioural considerations to keep in mind: Aggressive eaters may outcompete shy fish for food, leading to malnutrition. Shrimp eaters may also prey on very small nano fish.

Worth noting: Brown Bullhead Catfish is nocturnal and will be most active after lights-out, naturally reducing daytime encounters.

The safe temperature window for both species falls between 20°C and 26°C. Aim for the midpoint of this range (around 23.0°C) for optimal comfort.

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 5–15 dGH. Regular testing will ensure conditions stay within this range.

To house Brown Bullhead Catfish and Celestial Pearl Danio (Galaxy Rasbora) together, plan for an aquarium of at least 500 litres with a minimum length of 150 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), Smooth Gravel (Sensitive Barbels), Driftwood (Digestion/Hiding), Plants - Densely covered. 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.

Feeding time deserves special attention with this pairing. Brown Bullhead Catfish is a known shrimp eater and may prey on small invertebrates or nano fish like Celestial Pearl Danio (Galaxy Rasbora). Brown Bullhead Catfish is an aggressive eater that may prevent Celestial Pearl Danio (Galaxy Rasbora) from getting enough food.

Because Brown Bullhead Catfish is a fast, competitive feeder, consider using sinking pellets or feeding at opposite ends of the setup to ensure Celestial Pearl Danio (Galaxy Rasbora) receives an adequate share.