The Bucktooth Tetra is a highly active, predatory shoaling fish infamous for its scale-eating (lepidophagous) behavior. They are extremely aggressive and will strip the scales, fins, and even eyes off almost any tankmate. They must be kept in a species-only tank in large groups (12+) to disperse their intense conspecific aggression; otherwise, they will systematically kill each other.
At a Glance
Tank Requirements
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Water Parameters
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Temperament & Compatibility
Available Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Standard
The standard Bucktooth Tetra. Must be kept in a large species-only aquarium. Do not attempt to house with other species, including heavily armored bottom dwellers, as they will relentlessly attack them. A tight-fitting lid is required as their frantic feeding and chasing behavior often leads to jumping.
Differs in 1 trait from base species
Also known as: Wild Type
Bucktooth Tetra (Exodon) Care Guide Summary
The Bucktooth Tetra (Exodon), scientifically known as Exodon paradoxus, belongs to the Characins family group. Adults reach a maximum size of approximately 12 cm and have a fusiform body shape with a moderate growth rate. Classified as highly aggressive, this species primarily occupies the mid-level and surface zones of the aquarium and produces a medium level of biological waste.
To thrive, the Bucktooth Tetra (Exodon) requires a freshwater only aquarium with a minimum volume of 200 litres and a tank length of at least 120 cm. Water temperature should be maintained between 23°C and 28°C, with a pH range of 5.5–7.5 and a general hardness of 1–15 dGH. A moderate water flow is preferred. An aquarium test kit can help you monitor these values.
Due to its specialist needs, the Bucktooth Tetra (Exodon) is best suited for fishkeepers who can provide a carefully planned setup. The Bucktooth Tetra (Exodon) is typically available in one standard form.
Bucktooth Tetra (Exodon) Habitat Setup
When setting up an aquarium for the Bucktooth Tetra (Exodon), a moderate water flow best suits their natural preferences. Because this species occupies the mid-level and surface zones, the aquarium layout should prioritise adequate surface area with floating cover to make them feel secure near the waterline and open swimming space in the centre of the tank for free movement. Useful additions include driftwood, which can serve as both a hiding place and a dietary supplement. Keepers should note that a tight-fitting lid is essential, as this species is a known jumper.
Bucktooth Tetra (Exodon) Compatibility Notes
Classified as highly aggressive, the Bucktooth Tetra (Exodon) is a schooling species that feels most secure in a sizeable group, where natural shoaling behaviour reduces stress and brings out their best colours. When choosing tankmates, avoid housing with slow-moving or long-finned species that may become targets for fin nipping, any fish small enough to fit in its mouth will likely be eaten, conspecific aggression can be intense, especially in smaller tanks, and their energetic swimming style may stress more sedentary or timid species. Selecting tankmates that favour different water layers from the mid-level and surface zones can help reduce competition and territorial overlap.
Recommended Tank Sizes
Standard aquarium sizes that meet the minimum volume and length requirements for Bucktooth Tetra (Exodon).
55 Gallon Standard
60 Gallon Breeder
75 Gallon Standard
90 Gallon Standard
125 Gallon Standard
150 Gallon High
Frequently Asked Questions About Bucktooth Tetra (Exodon)
How big does Bucktooth Tetra (Exodon) get?
Bucktooth Tetra (Exodon) (Exodon paradoxus) typically reaches a maximum adult size of approximately 12 cm. They have a fusiform body shape and a moderate growth rate.
What tank size does Bucktooth Tetra (Exodon) need?
A minimum aquarium volume of 200 litres and a tank length of at least 120 cm are recommended for Bucktooth Tetra (Exodon). This ensures enough swimming space and helps maintain stable water conditions.
What water parameters does Bucktooth Tetra (Exodon) need?
Bucktooth Tetra (Exodon) thrives in freshwater only conditions with a temperature range of 23–28°C, a pH between 5.5 and 7.5, and a general hardness of 1–15 dGH. A moderate water flow is preferred.
Is Bucktooth Tetra (Exodon) peaceful or aggressive?
Bucktooth Tetra (Exodon) is classified as highly aggressive with an aggression score of 9 out of 10. Careful tankmate selection is essential to avoid conflict.
How many Bucktooth Tetra (Exodon) should be kept together?
Bucktooth Tetra (Exodon) is a schooling species and should be kept in groups of at least 12. Larger groups help distribute aggression and encourage natural schooling behaviour.
Does Bucktooth Tetra (Exodon) have any special tank requirements?
Yes. Bucktooth Tetra (Exodon) benefits from driftwood (digestion/hiding) in the aquarium. These features help replicate their natural habitat and promote overall health and well-being.
Does Bucktooth Tetra (Exodon) need a lid on the tank?
Yes. Bucktooth Tetra (Exodon) is a known jumper, and a tight-fitting lid or cover is essential to prevent escape. Even a small gap can be enough for a determined fish to leap out.
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