Can Betta Macrostoma and Bucktooth Tetra (Exodon) Live Together?
Betta Macrostoma and Bucktooth Tetra (Exodon) are not recommended as tank mates due to eye biters attack slow-moving fish, risking permanent injury.. 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 Bucktooth Tetra (Exodon)?
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
Betta Macrostoma is a moderately assertive species (6/10), while Bucktooth Tetra (Exodon) is highly aggressive (9/10). This modest difference means Bucktooth Tetra (Exodon) may occasionally assert dominance over Betta Macrostoma.
Betta Macrostoma and Bucktooth Tetra (Exodon) both frequent the Top (Surface) and 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.
There is a critical concern: the Shy / Slow Moving (Easily Stressed) behaviour of one fish directly conflicts with the Eye Biter (Attacks slow moving fish) trait of the other — eye biters attack slow-moving fish, risking permanent injury..
Additional behavioural considerations to keep in mind: Aggressive fish may bully and stress shy, slow-moving species. Hyperactive swimmers can stress shy, slow-moving species through constant motion.
Worth noting: Betta Macrostoma is a known jumper, so a tight-fitting lid is essential.
Water Parameters
The safe temperature window for both species falls between 23°C and 25°C. Aim for the midpoint of this range (around 24.0°C) for optimal comfort.
Both fish can tolerate a pH between 5.5 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.
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Tank Setup
To house Betta Macrostoma and Bucktooth Tetra (Exodon) together, plan for an aquarium of at least 200 litres with a minimum length of 120 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. 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 Betta Macrostoma and Bucktooth Tetra (Exodon).
55 Gallon Standard
60 Gallon Breeder
75 Gallon Standard
90 Gallon Standard
125 Gallon Standard
150 Gallon High
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Frequently Asked Questions
Can Betta Macrostoma and Bucktooth Tetra (Exodon) live together?
No. This combination is not recommended. Key incompatibilities — such as critical behavioural conflicts — make cohabitation unsafe.
What size tank do Betta Macrostoma and Bucktooth Tetra (Exodon) need?
A minimum of 200 litres (tank length at least 120 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 Bucktooth Tetra (Exodon) together?
Keep the aquarium between 23°C and 25°C. A target of around 24.0°C sits comfortably within both species' preferred ranges.
Are Betta Macrostoma or Bucktooth Tetra (Exodon) aggressive?
Betta Macrostoma is moderately assertive (6/10) and Bucktooth Tetra (Exodon) is highly aggressive (9/10). Their similar temperaments generally lead to a peaceful coexistence.
What pH do Betta Macrostoma and Bucktooth Tetra (Exodon) need?
Both species overlap in the 5.5–6 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.
Will Bucktooth Tetra (Exodon) nip Betta Macrostoma's fins?
Bucktooth Tetra (Exodon) is a known fin nipper. If Betta Macrostoma has long or flowing fins, there is a real risk of fin damage. Keeping Bucktooth Tetra (Exodon) in a larger group can help redirect nipping behaviour toward conspecifics.
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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