Can Bucktooth Tetra (Exodon) and Tire Track Eel Live Together?

🟡Possible with Caution

Keeping Bucktooth Tetra (Exodon) and Tire Track Eel together is possible but requires caution, though some care is needed. Provide a spacious tank of at least 816 litres with plenty of hiding spots to reduce stress. Monitor behaviour closely, especially during the first few weeks.


At a Glance

Bucktooth Tetra (Exodon)

Exodon paradoxus

Tire Track Eel

Mastacembelus armatus

🐠Family Group
Bucktooth Tetra (Exodon)
Characins
Tire Track Eel
Oddballs
Temperament
Bucktooth Tetra (Exodon)
Highly Aggressive (9/10)
Tire Track Eel
Semi-Aggressive (6/10)
Temperature
✓ Compatible
Bucktooth Tetra (Exodon)
23–28°C
Tire Track Eel
22–28°C
pH Range
✓ Compatible
Bucktooth Tetra (Exodon)
5.5–7.5
Tire Track Eel
6.5–7.5
Hardness (dGH)
✓ Compatible
Bucktooth Tetra (Exodon)
1–15
Tire Track Eel
5–15
Water Type
✓ Compatible
Bucktooth Tetra (Exodon)
Freshwater Only
Tire Track Eel
Freshwater Only
Flow Preference
✓ Compatible
Bucktooth Tetra (Exodon)
Moderate
Tire Track Eel
Moderate
Min Tank Volume
Combined: 816 L
Bucktooth Tetra (Exodon)
200 L
Tire Track Eel
680 L
Swimming Level
✓ Different zones
Bucktooth Tetra (Exodon)
MiddleTop
Tire Track Eel
Bottom
🏷️Behavior Tags
Bucktooth Tetra (Exodon)
Generally AggressiveAggressive to same species/look-alikesFin NipperPiscivore (Eats small/nano fish)Hyperactive / Fast SwimmerEye Biter (Attacks slow moving fish)Jumper (Lid Required)
Tire Track Eel
Piscivore (Eats small/nano fish)Shrimp EaterDigger (Disturbs Substrate)Jumper (Lid Required)NocturnalAggressive to same species/look-alikes

Behaviour & Temperament

Bucktooth Tetra (Exodon) is a highly aggressive species (9/10), while Tire Track Eel is moderately assertive (6/10). This modest difference means Bucktooth Tetra (Exodon) may occasionally assert dominance over Tire Track Eel.

In terms of spatial distribution, Bucktooth Tetra (Exodon) prefers the Middle (Open Water) and Top (Surface) zones, whereas Tire Track Eel occupies the Bottom (Substrate) zone. Because they use different levels of the water column, territorial disputes are less likely and the tank will appear more balanced.

Worth noting: Tire Track Eel is nocturnal and will be most active after lights-out, naturally reducing daytime encounters. Also, 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: 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 28°C. Aim for the midpoint of this range (around 25.5°C) for optimal comfort.

Both fish can tolerate a pH between 6.5 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 5–15 dGH. Regular testing will ensure conditions stay within this range.

Tank Setup

To house Bucktooth Tetra (Exodon) and Tire Track Eel together, plan for an aquarium of at least 816 litres with a minimum length of 180 cm. This accounts for the larger species' space requirements with an additional 20 % buffer to reduce territorial tension.

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: Driftwood (Digestion/Hiding), Sand (Sifters), Smooth Gravel (Sensitive Barbels). 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.

Frequently Asked Questions

Can Bucktooth Tetra (Exodon) and Tire Track Eel live together?

They can coexist, but the pairing requires careful monitoring. Provide ample space (at least 816 litres), plenty of hiding spots, and watch for signs of stress or aggression.

What size tank do Bucktooth Tetra (Exodon) and Tire Track Eel need?

A minimum of 816 litres (tank length at least 180 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 Bucktooth Tetra (Exodon) and Tire Track Eel together?

Keep the aquarium between 23°C and 28°C. A target of around 25.5°C sits comfortably within both species' preferred ranges.

Are Bucktooth Tetra (Exodon) or Tire Track Eel aggressive?

Bucktooth Tetra (Exodon) is highly aggressive (9/10) and Tire Track Eel is moderately assertive (6/10). Their similar temperaments generally lead to a peaceful coexistence.

What pH do Bucktooth Tetra (Exodon) and Tire Track Eel need?

Both species overlap in the 6.5–7.5 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.

Will Bucktooth Tetra (Exodon) nip Tire Track Eel's fins?

Bucktooth Tetra (Exodon) is a known fin nipper. If Tire Track Eel 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.

Does Tire Track Eel being nocturnal affect compatibility?

Tire Track Eel 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 Tire Track Eel during evening hours.


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