Can Black Ruby Barb and Bucktooth Tetra (Exodon) Live Together?
Keeping Black Ruby Barb and Bucktooth Tetra (Exodon) together is possible but requires caution due to differing aggression levels. Provide a spacious tank of at least 200 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 Black Ruby Barb 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
Black Ruby Barb is a generally mild-mannered species (3/10), while Bucktooth Tetra (Exodon) is highly aggressive (9/10). This notable difference means Bucktooth Tetra (Exodon) may occasionally assert dominance over Black Ruby Barb.
Large aggression gap (6 points) between Black Ruby Barb and Bucktooth Tetra (Exodon) increases stress risk for the more peaceful fish.
Black Ruby Barb and Bucktooth Tetra (Exodon) both frequent the 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.
Worth noting: Bucktooth Tetra (Exodon) 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. Keep fin nippers in larger groups to distribute nipping behaviour among conspecifics rather than tank mates.
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.
Both fish can tolerate a pH between 5.5 and 7.5. Maintaining a stable value within this band is more important than hitting an exact number.
For general hardness, the shared comfort zone is 2–15 dGH. Regular testing will ensure conditions stay within this range.
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Tank Setup
To house Black Ruby Barb 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.
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: Plants - Densely covered, Leaf Litter/Blackwater, Driftwood (Digestion/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 Black Ruby Barb 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 Black Ruby Barb and Bucktooth Tetra (Exodon) live together?
They can coexist, but the pairing requires careful monitoring. Provide ample space (at least 200 litres), plenty of hiding spots, and watch for signs of stress or aggression.
What size tank do Black Ruby Barb 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 Black Ruby Barb and Bucktooth Tetra (Exodon) 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 Black Ruby Barb or Bucktooth Tetra (Exodon) aggressive?
Black Ruby Barb is generally mild-mannered (3/10) and Bucktooth Tetra (Exodon) is highly aggressive (9/10). The gap in aggression levels means the calmer fish may experience stress from the more assertive one.
What pH do Black Ruby Barb and Bucktooth Tetra (Exodon) need?
Both species overlap in the 5.5–7.5 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.
Will Bucktooth Tetra (Exodon) nip Black Ruby Barb's fins?
Bucktooth Tetra (Exodon) is a known fin nipper. If Black Ruby Barb 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.
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