Can Blue Back Blue Eye and Cardinal Shrimp (Sulawesi) Live Together?

Blue Back Blue Eye is a peaceful species (2/10), while Cardinal Shrimp (Sulawesi) is peaceful (0/10). This modest difference means Blue Back Blue Eye may occasionally assert dominance over Cardinal Shrimp (Sulawesi).

In terms of spatial distribution, Blue Back Blue Eye prefers the Top (Surface) and Middle (Open Water) zones, whereas Cardinal Shrimp (Sulawesi) 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.

Worth noting: Blue Back Blue Eye is a known jumper, so a tight-fitting lid is essential.

The safe temperature window for both species falls between 26°C and 30°C. Aim for the midpoint of this range (around 28.0°C) for optimal comfort.

Both fish can tolerate a pH between 7.5 and 8.5. Maintaining a stable value within this band is more important than hitting an exact number.

Hardness requirements are incompatible: Blue Back Blue Eye needs 10–30 dGH while Cardinal Shrimp (Sulawesi) requires 4–8 dGH.

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 Blue Back Blue Eye and Cardinal Shrimp (Sulawesi) together, plan for an aquarium of at least 38 litres with a minimum length of 45 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: Driftwood (Digestion/Hiding), Sand (Sifters), Established Algae (Otocinclus), 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.

Blue Back Blue Eye and Cardinal Shrimp (Sulawesi) 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.