Can Aequidens sp. Atabapo and Blue Back Blue Eye Live Together?
Aequidens sp. Atabapo and Blue Back Blue Eye are not recommended as tank mates due to incompatible water types and incompatible hardness ranges. Housing these species together is likely to result in stress, health problems, or direct harm to one or both fish.
At a Glance
Can your tank handle Aequidens sp. Atabapo and Blue Back Blue Eye?
Compatibility is only part of the answer. Test both fish with your real tank size, current stock, and maintenance needs to see if you have enough space and a safe stocking level before you add them.
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Behaviour & Temperament
Aequidens sp. Atabapo is a moderately assertive species (6/10), while Blue Back Blue Eye is peaceful (2/10). This notable difference means Aequidens sp. Atabapo may occasionally assert dominance over Blue Back Blue Eye.
Aequidens sp. Atabapo and Blue Back Blue Eye 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: Shrimp eaters may also prey on very small nano fish.
Worth noting: Blue Back Blue Eye is a known jumper, so a tight-fitting lid is essential.
Water Parameters
The safe temperature window for both species falls between 25°C and 29°C. Aim for the midpoint of this range (around 27.0°C) for optimal comfort.
Both fish can tolerate a pH between 7 and 7. Maintaining a stable value within this band is more important than hitting an exact number.
Hardness requirements are incompatible: Aequidens sp. Atabapo needs 1–8 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.
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Tank Setup
To house Aequidens sp. Atabapo and Blue Back Blue Eye together, plan for an aquarium of at least 110 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: Sand (Sifters), Driftwood (Digestion/Hiding), Leaf Litter/Blackwater. 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.
Suitable Tank Sizes
Standard aquarium sizes large enough for both Aequidens sp. Atabapo and Blue Back Blue Eye.
30 Gallon Breeder
40 Gallon Breeder
55 Gallon Standard
60 Gallon Breeder
75 Gallon Standard
90 Gallon Standard
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Diet & Feeding
Feeding time deserves special attention with this pairing. Aequidens sp. Atabapo is a known shrimp eater and may prey on small invertebrates or nano fish like Blue Back Blue Eye.
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Frequently Asked Questions
Can Aequidens sp. Atabapo and Blue Back Blue Eye live together?
No. This combination is not recommended. Key incompatibilities — such as different water type needs — make cohabitation unsafe.
What size tank do Aequidens sp. Atabapo and Blue Back Blue Eye need?
A minimum of 110 litres (tank length at least 90 cm) is recommended. This provides enough space for both species to establish their own areas and reduces the likelihood of territorial disputes.
What water temperature is best for Aequidens sp. Atabapo and Blue Back Blue Eye together?
Keep the aquarium between 25°C and 29°C. A target of around 27.0°C sits comfortably within both species' preferred ranges.
Are Aequidens sp. Atabapo or Blue Back Blue Eye aggressive?
Aequidens sp. Atabapo is moderately assertive (6/10) and Blue Back Blue Eye is peaceful (2/10). The gap in aggression levels means the calmer fish may experience stress from the more assertive one.
What pH do Aequidens sp. Atabapo and Blue Back Blue Eye need?
Both species overlap in the 7–7 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.
How do I manage Aequidens sp. Atabapo's territorial behaviour?
Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives Aequidens sp. Atabapo space to claim a territory without encroaching on the other fish's area. Adding décor that divides the tank into distinct zones works especially well.
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