Can Blue Dolphin (Hap) and Cardinal Tetra Live Together?

Blue Dolphin (Hap) is a moderately assertive species (5/10), while Cardinal Tetra is peaceful (1/10). This notable difference means Blue Dolphin (Hap) may occasionally assert dominance over Cardinal Tetra.

Blue Dolphin (Hap) and Cardinal Tetra 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: Hyperactive swimmers can stress shy, slow-moving species through constant motion.

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.

The pH requirements of Blue Dolphin (Hap) (7.5–8.6) and Cardinal Tetra (4–7) do not overlap, making it impossible to satisfy both species simultaneously.

Hardness requirements are incompatible: Blue Dolphin (Hap) needs 10–25 dGH while Cardinal Tetra requires 1–8 dGH.

To house Blue Dolphin (Hap) and Cardinal Tetra together, plan for an aquarium of at least 475 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), Leaf Litter/Blackwater, 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.

Blue Dolphin (Hap) and Cardinal Tetra 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.