Can African Arowana and Freshwater Harlequin Shrimp (Sulawesi) Live Together?
Keeping African Arowana and Freshwater Harlequin Shrimp (Sulawesi) together is possible but requires caution due to differing aggression levels and potential behavioral clashes. Provide a spacious tank of at least 1500 litres with plenty of hiding spots to reduce stress. Monitor behaviour closely, especially during the first few weeks.
At a Glance
Can your tank handle African Arowana and Freshwater Harlequin Shrimp (Sulawesi)?
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
African Arowana is a generally mild-mannered species (4/10), while Freshwater Harlequin Shrimp (Sulawesi) is peaceful (0/10). This notable difference means African Arowana may occasionally assert dominance over Freshwater Harlequin Shrimp (Sulawesi).
African Arowana and Freshwater Harlequin Shrimp (Sulawesi) 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.
Additional behavioural considerations to keep in mind: Hyperactive swimmers can stress shy, slow-moving species through constant motion.
Worth noting: Freshwater Harlequin Shrimp (Sulawesi) is nocturnal and will be most active after lights-out, naturally reducing daytime encounters. Also, African Arowana is a known jumper, so a tight-fitting lid is essential.
To improve the chances of a peaceful coexistence in this community tank: A larger aquarium with ample hiding spots can help diffuse aggression and give the less dominant fish space to retreat.
Water Parameters
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. Maintaining a stable value within this band is more important than hitting an exact number.
For general hardness, the shared comfort zone is 5–8 dGH. Regular testing will ensure conditions stay within this range.
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Tank Setup
To house African Arowana and Freshwater Harlequin Shrimp (Sulawesi) together, plan for an aquarium of at least 1500 litres with a minimum length of 250 cm. This recommendation combines the stricter species minimums with a community-load allowance so the pairing has realistic long-term space and filtration headroom.
Because this pairing requires extra vigilance, include plenty of hiding spots — caves, driftwood, and dense plant clusters — so the less dominant fish can retreat when needed.
Specific environmental needs for this combination include: Sand (Sifters), Smooth Gravel (Sensitive Barbels), Established Algae (Otocinclus). 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.
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Frequently Asked Questions
Can African Arowana and Freshwater Harlequin Shrimp (Sulawesi) live together?
They can coexist, but the pairing requires careful monitoring. Provide ample space (at least 1500 litres), plenty of hiding spots, and watch for signs of stress or aggression.
What size tank do African Arowana and Freshwater Harlequin Shrimp (Sulawesi) need?
A minimum of 1500 litres (tank length at least 250 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 Arowana and Freshwater Harlequin Shrimp (Sulawesi) together?
Keep the aquarium between 26°C and 30°C. A target of around 28.0°C sits comfortably within both species' preferred ranges.
Are African Arowana or Freshwater Harlequin Shrimp (Sulawesi) aggressive?
African Arowana is generally mild-mannered (4/10) and Freshwater Harlequin Shrimp (Sulawesi) is peaceful (0/10). The gap in aggression levels means the calmer fish may experience stress from the more assertive one.
What pH do African Arowana and Freshwater Harlequin Shrimp (Sulawesi) need?
Both species overlap in the 7.5–8 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.
Does Freshwater Harlequin Shrimp (Sulawesi) being nocturnal affect compatibility?
Freshwater Harlequin Shrimp (Sulawesi) 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 Freshwater Harlequin Shrimp (Sulawesi) during evening hours.
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