Can African Butterfly Fish and Molly (Sailfin/Black/Dalmatian) Live Together?
African Butterfly Fish and Molly (Sailfin/Black/Dalmatian) are not recommended as tank mates due to 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
Behaviour & Temperament
African Butterfly Fish is a moderately assertive species (5/10), while Molly (Sailfin/Black/Dalmatian) is generally mild-mannered (3/10). This modest difference means African Butterfly Fish may occasionally assert dominance over Molly (Sailfin/Black/Dalmatian).
African Butterfly Fish and Molly (Sailfin/Black/Dalmatian) both frequent the Top (Surface) region of the setup. This overlap can increase competition for space, so providing ample room and cover is important to keep both species comfortable.
Worth noting: African Butterfly Fish is nocturnal and will be most active after lights-out, naturally reducing daytime encounters. Also, African Butterfly Fish is a known jumper, so a tight-fitting lid is essential.
Water Parameters
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.
Both fish can tolerate a pH between 7.5 and 7.5. Maintaining a stable value within this band is more important than hitting an exact number.
Hardness requirements are incompatible: African Butterfly Fish needs 1–10 dGH while Molly (Sailfin/Black/Dalmatian) requires 12–30 dGH.
Tank Setup
To house African Butterfly Fish and Molly (Sailfin/Black/Dalmatian) together, plan for an aquarium of at least 96 litres with a minimum length of 80 cm. This accounts for the larger species' space requirements with an additional 20 % buffer to reduce territorial tension.
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: Plants - Floating, Plants - Densely covered, Established Algae (Otocinclus). 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.
Frequently Asked Questions
Can African Butterfly Fish and Molly (Sailfin/Black/Dalmatian) live together?▾
No. This combination is not recommended. Key incompatibilities — such as critical behavioural conflicts — make cohabitation unsafe.
What size tank do African Butterfly Fish and Molly (Sailfin/Black/Dalmatian) need?▾
A minimum of 96 litres (tank length at least 80 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 African Butterfly Fish and Molly (Sailfin/Black/Dalmatian) together?▾
Keep the aquarium between 24°C and 28°C. A target of around 26.0°C sits comfortably within both species' preferred ranges.
Are African Butterfly Fish or Molly (Sailfin/Black/Dalmatian) aggressive?▾
African Butterfly Fish is moderately assertive (5/10) and Molly (Sailfin/Black/Dalmatian) is generally mild-mannered (3/10). Their similar temperaments generally lead to a peaceful coexistence.
What pH do African Butterfly Fish and Molly (Sailfin/Black/Dalmatian) need?▾
Both species overlap in the 7.5–7.5 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.
How do I manage African Butterfly Fish's territorial behaviour?▾
Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives African Butterfly Fish 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.
Does African Butterfly Fish being nocturnal affect compatibility?▾
African Butterfly Fish is most active after lights-out, which naturally reduces daytime encounters with its tank mate. This can actually be beneficial, as both fish get undisturbed time to feed and explore. Just ensure food reaches African Butterfly Fish during evening hours.
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