Can Ceylon Puffer (Brackish) and Cherry Spot Rasbora Live Together?

Ceylon Puffer (Brackish) is a semi-aggressive species (8/10), while Cherry Spot Rasbora is peaceful (1/10). This notable difference means Ceylon Puffer (Brackish) may occasionally assert dominance over Cherry Spot Rasbora.

Large aggression gap (7 points) between Ceylon Puffer (Brackish) and Cherry Spot Rasbora increases stress risk for the more peaceful fish.

Ceylon Puffer (Brackish) and Cherry Spot Rasbora both frequent the 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: Aggressive fish may bully and stress shy, slow-moving species. Hyperactive swimmers can stress shy, slow-moving species through constant motion. Shrimp eaters may also prey on very small nano fish.

The safe temperature window for both species falls between 24°C and 28°C. Aim for the midpoint of this range (around 26.0°C) for optimal comfort.

Both fish can tolerate a pH between 7.5 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 12–12 dGH. Regular testing will ensure conditions stay within this range.

Crucially, these species require different water types — one needs freshwater while the other requires brackish conditions. This is a hard barrier to keeping them together.

To house Ceylon Puffer (Brackish) and Cherry Spot Rasbora together, plan for an aquarium of at least 150 litres with a minimum length of 90 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: Shells (Breeding/Hiding), Sand (Sifters), Plants - Densely covered, Plants - Floating. 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.

Ceylon Puffer (Brackish) and Cherry Spot Rasbora 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. Ceylon Puffer (Brackish) is a known shrimp eater and may prey on small invertebrates or nano fish like Cherry Spot Rasbora.