Can Adolfo Cory and Black Ocellatus Live Together?
Adolfo Cory and Black Ocellatus are not recommended as tank mates due to conflicting pH requirements. 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 Adolfo Cory and Black Ocellatus?
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
Adolfo Cory is a peaceful species (1/10), while Black Ocellatus is semi-aggressive (7/10). This notable difference means Black Ocellatus may occasionally assert dominance over Adolfo Cory.
Large aggression gap (6 points) between Adolfo Cory and Black Ocellatus increases stress risk for the more peaceful fish.
Adolfo Cory and Black Ocellatus both frequent the Bottom (Substrate) region of the setup. This overlap can increase competition for space, so providing ample room and cover is important to keep both species comfortable.
Water Parameters
The safe temperature window for both species falls between 23°C and 26°C. Aim for the midpoint of this range (around 24.5°C) for optimal comfort.
The pH requirements of Adolfo Cory (4–7) and Black Ocellatus (7.5–9) do not overlap, making it impossible to satisfy both species simultaneously.
For general hardness, the shared comfort zone is 8–10 dGH. Regular testing will ensure conditions stay within this range.
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Tank Setup
To house Adolfo Cory and Black Ocellatus 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, Smooth Gravel (Sensitive Barbels), Shells (Breeding/Hiding). 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.
Suitable Tank Sizes
Standard aquarium sizes large enough for both Adolfo Cory and Black Ocellatus.
20 Gallon High
20 Gallon Long
29 Gallon Standard
30 Gallon Breeder
36 Gallon Bowfront
40 Gallon Breeder
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Frequently Asked Questions
Can Adolfo Cory and Black Ocellatus live together?
No. This combination is not recommended. Key incompatibilities — such as critical behavioural conflicts — make cohabitation unsafe.
What size tank do Adolfo Cory and Black Ocellatus need?
A minimum of 60 litres (tank length at least 60 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 Adolfo Cory and Black Ocellatus together?
Keep the aquarium between 23°C and 26°C. A target of around 24.5°C sits comfortably within both species' preferred ranges.
Are Adolfo Cory or Black Ocellatus aggressive?
Adolfo Cory is peaceful (1/10) and Black Ocellatus is semi-aggressive (7/10). The gap in aggression levels means the calmer fish may experience stress from the more assertive one.
What pH do Adolfo Cory and Black Ocellatus need?
Their pH requirements do not overlap. Adolfo Cory prefers 4–7, while Black Ocellatus needs 7.5–9. This makes them incompatible in the same water chemistry.
How do I manage Black Ocellatus's territorial behaviour?
Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives Black Ocellatus 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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