Can Apistogramma baenschi (Inca 50) and Blue Back Blue Eye Live Together?

Apistogramma baenschi (Inca 50) is a moderately assertive species (5/10), while Blue Back Blue Eye is peaceful (2/10). This modest difference means Apistogramma baenschi (Inca 50) may occasionally assert dominance over Blue Back Blue Eye.

In terms of spatial distribution, Apistogramma baenschi (Inca 50) prefers the Bottom (Substrate) zone, whereas Blue Back Blue Eye occupies the Top (Surface) and Middle (Open Water) zones. 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 22°C and 26°C. Aim for the midpoint of this range (around 24.0°C) for optimal comfort.

The pH requirements of Apistogramma baenschi (Inca 50) (4–6.5) and Blue Back Blue Eye (7–8.5) do not overlap, making it impossible to satisfy both species simultaneously.

Hardness requirements are incompatible: Apistogramma baenschi (Inca 50) needs 1–5 dGH while Blue Back Blue Eye requires 10–30 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 Apistogramma baenschi (Inca 50) and Blue Back Blue Eye together, plan for an aquarium of at least 60 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.

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), Leaf Litter/Blackwater, Driftwood (Digestion/Hiding). Meeting these requirements will help both species thrive.

Both species do well with low (still water) water movement, so a standard filtration setup rated for the tank volume should suffice.

Apistogramma baenschi (Inca 50) and Blue Back Blue Eye 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.