Can Betta Macrostoma and Uaru Live Together?
Betta Macrostoma and Uaru are not recommended as tank mates due to no temperature overlap. 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 Betta Macrostoma and Uaru?
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.
Behaviour & Temperament
Betta Macrostoma is a moderately assertive species (6/10), while Uaru is generally mild-mannered (4/10). This modest difference means Betta Macrostoma may occasionally assert dominance over Uaru.
Betta Macrostoma and Uaru both frequent the Middle (Open Water) and 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.
Worth noting: Betta Macrostoma is a known jumper, so a tight-fitting lid is essential.
Water Parameters
There is no temperature overlap between Betta Macrostoma (20–25°C) and Uaru (27–30°C). This fundamental mismatch makes long-term cohabitation impractical.
Both fish can tolerate a pH between 5 and 6. Maintaining a stable value within this band is more important than hitting an exact number.
For general hardness, the shared comfort zone is 1–5 dGH. Regular testing will ensure conditions stay within this range.
Tank Setup
To house Betta Macrostoma and Uaru together, plan for an aquarium of at least 400 litres with a minimum length of 150 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: Leaf Litter/Blackwater, Driftwood (Digestion/Hiding), Plants - Floating, Sand (Sifters). 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.
Why This Pairing Usually Fails in Practice
Betta Macrostoma and Uaru 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.
Suitable Tank Sizes
Standard aquarium sizes large enough for both Betta Macrostoma and Uaru.
Frequently Asked Questions
Can Betta Macrostoma and Uaru live together?
No. This combination is not recommended. Key incompatibilities — such as non-overlapping temperature ranges — make cohabitation unsafe.
What size tank do Betta Macrostoma and Uaru need?
A minimum of 400 litres (tank length at least 150 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 Betta Macrostoma and Uaru together?
Unfortunately, there is no temperature range that satisfies both species. Betta Macrostoma requires 20–25°C, while Uaru needs 27–30°C.
Are Betta Macrostoma or Uaru aggressive?
Betta Macrostoma is moderately assertive (6/10) and Uaru is generally mild-mannered (4/10). Their similar temperaments generally lead to a peaceful coexistence.
What pH do Betta Macrostoma and Uaru need?
Both species overlap in the 5–6 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.
How do I manage Betta Macrostoma's territorial behaviour?
Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives Betta Macrostoma 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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Guidarium Editorial Desk
Reviewed against Guidarium care, stocking, and compatibility standards. Read the editorial policy.
- Last reviewed
- May 1, 2026
- Last updated
- May 1, 2026
- Issues or corrections?
- Contact the editorial team
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