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Peter’s elephantnose fish (Gnathonemus petersii) is listed at up to about 23 cm (9.1 inches) in an aquarium-care profile. FishBase records a larger maximum of 35.0 cm standard length, a different measurement that should not be treated as the usual aquarium adult size. For planning, favor a long aquarium at least 150 cm long; Aquarium Lesson recommends 120 US gallons (about 454 L) or more. Published volume recommendations conflict, however: Aqua-Pedia lists 240 L, so there is no single agreed minimum in these sources.
How large does an elephantnose fish get?
The commonly cited care-profile figure and the largest database figure are not directly equivalent. Aquarium Lesson lists Peter’s elephantnose fish as reaching 23 cm, or about 9.1 inches. FishBase records a maximum of 35.0 cm standard length (SL). The first is an aquarium-care profile’s adult-size figure; the second is a recorded species maximum expressed using a specific length measurement.
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Adult-size figure versus recorded maximum
Aquarium Lesson’s 23 cm figure is useful as a practical expectation in a care profile, but it is not presented as a controlled growth study or as a guarantee that every fish will reach that length. FishBase’s 35.0 cm figure is explicitly a maximum, not a promise about the size a typical aquarium fish will attain. Neither number should be silently substituted for the other.
The measurement basis matters, too. Standard length measures from the snout to the base of the tail fin; total length includes the tail fin. FishBase labels its 35.0 cm record as standard length. Aquarium Lesson’s 23 cm listing does not clearly state that it uses the same basis. Because of that difference, it is not possible to make a clean like-for-like comparison between the two figures. Treat 23 cm as a care-profile adult-size reference and 35.0 cm SL as a larger recorded maximum.
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For an owner, the practical implication is to avoid sizing a tank around the smaller figure alone. The available sources do not establish a typical growth curve, a captive-versus-wild size comparison, or the proportion of fish that approach the recorded maximum. Planning should account for a substantial fish and its bottom-oriented behavior rather than assume that a small juvenile will remain small.
What tank size should you plan for?
A cautious planning target is a long aquarium at least 150 cm in length, with 120 US gallons (about 454 L) or more as a conservative volume reference. Aquarium Lesson gives both the 150 cm minimum length and 120-gallon-or-larger recommendation. FishBase’s aquarium note also gives a 150 cm minimum length, which makes length the clearest point of agreement between those sources.
Do not read the gallon figure in isolation. A volume number does not tell you the aquarium’s length or how much usable bottom area it provides. FishBase describes the species as living close to the bottom and probing there for food, so the long footprint in the cited guidance is relevant to the fish’s way of using the aquarium. The cited sources do not provide a standard width or height, and they do not establish a tested set of dimensions beyond the 150 cm length recommendation.
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Why the recommendations differ
| Source | Tank guidance | How to interpret it |
|---|---|---|
| Aquarium Lesson | At least 150 cm long; 120 US gallons (about 454 L) or larger | A conservative long-tank recommendation from a care profile; publication date is not stated on the result page. |
| FishBase | 150 cm minimum length in its aquarium-keeping note | Corroborates the cited length, but the note does not supply the same 120-gallon volume figure. |
| Aqua-Pedia | 240 L minimum tank volume | A substantially smaller volume recommendation than Aquarium Lesson’s 120 US gallons; publication date is not stated on the result page. |
These figures are materially different: 120 US gallons is about 454 L, well above 240 L. The cited sources do not explain why their recommendations diverge, and they do not provide a controlled comparison showing how fish fare in tanks of different sizes. The 240 L listing therefore should not be treated as proof that a shorter or smaller tank is adequate. Where the guidance conflicts, the more cautious course is to plan around a long aquarium and the higher volume reference while recognizing that it is a care-profile recommendation, not a universally settled threshold.
How behavior affects the tank and stocking decision
FishBase describes elephantnose fish as bottom-dwelling, probing for food with a long snout, and feeding mostly at night on worms and insects. Those details make usable floor area and an arrangement that accommodates bottom-foraging more directly relevant than nominal water volume by itself. Aqua-Pedia recommends soft substrate, cover, dim conditions, and clean, gentle water. These are profile recommendations; the cited material does not establish them as results of laboratory tests or give numerical water-flow or lighting targets.
Territorial behavior and conspecifics
FishBase characterizes the species as territorial and usually aggressive toward members of its own species. Aqua-Pedia likewise describes it as potentially territorial toward conspecifics. That is a reason to be cautious about keeping multiple elephantnose fish together, not a basis for assuming that any particular group arrangement will work in every aquarium.
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There is also a tension in the published guidance. FishBase’s aquarium-keeping note recommends groups of five or more, while the same database entry reports territoriality and usual aggression toward its own species; care profiles also discuss keeping a single fish. The group recommendation belongs specifically to FishBase’s cited aquarium note. The available sources do not resolve how its group advice should be reconciled with the territoriality description, so do not convert it into a universal stocking rule. A prospective keeper should not add conspecifics solely because of that one note without a clear, suitably spacious plan.
Other fish and invertebrates
A reader may be considering one elephantnose fish with a snail or a few neon tetras. Those examples do not establish compatibility. The cited sources do not provide a tested tankmate list or enough evidence to promise that a particular snail or tetra arrangement is suitable. FishBase’s report that the elephantnose fish is territorial toward its own species is specifically about conspecifics; it does not, by itself, prove either compatibility or incompatibility with unrelated tankmates.
Make the aquarium size decision for the elephantnose fish first, rather than treating smaller tankmates as a reason to reduce its footprint. Then assess any proposed companions separately and cautiously. The sources here do not establish specific stocking counts, compatibility outcomes, or a safe number of tankmates for a given tank volume.
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Setup considerations supported by the care profiles
Tank length and volume are only part of the plan. Aqua-Pedia’s setup guidance points to a dim environment, soft substrate, cover, and clean, gentle water. FishBase’s description of a bottom-dwelling, nocturnal feeder helps explain why those suggestions are relevant: the fish spends time near the bottom and searches for food there, often at night. The recommendations below are profile guidance rather than quantified husbandry standards.
- Prioritize a long footprint. Use the 150 cm length cited by both FishBase’s aquarium note and Aquarium Lesson as the clearest shared dimension in the available guidance.
- Keep substrate in mind. Aqua-Pedia recommends soft substrate. The source does not specify a depth or material, so no exact substrate recipe can be inferred from that recommendation.
- Provide cover and subdued conditions. Aqua-Pedia recommends cover, driftwood, planting, and dim conditions. These are profile suggestions, not proof that a particular decoration or lighting schedule is mandatory.
- Keep water clean and gentle. Aqua-Pedia uses those terms but does not provide numerical water parameters or a flow rate in the cited material. Do not mistake the qualitative guidance for a specific tested specification.
- Plan feeding around the described habits. FishBase reports mostly nocturnal feeding on worms and insects and probing with the snout. The sources do not set a feeding schedule, portion size, or complete diet, so those details need a separate, reliable care reference.
A practical way to make the decision
If you are deciding whether an aquarium is suitable, compare it with the evidence in this order rather than starting with the gallon label alone:
- Check the length. If the aquarium is shorter than 150 cm, it falls below the length specified in both FishBase’s aquarium note and Aquarium Lesson’s recommendation.
- Consider volume conservatively. Aquarium Lesson recommends 120 US gallons (about 454 L) or larger, while Aqua-Pedia lists 240 L. Since the sources do not resolve that discrepancy, use the higher figure as a cautious reference rather than treating the lower one as an established equivalent.
- Consider the usable bottom area. The fish is described by FishBase as bottom-dwelling and probing for food. A stated volume alone cannot establish how much floor area is available.
- Decide on stocking separately. Do not assume that another elephantnose fish is appropriate because FishBase’s aquarium note mentions groups, or that a snail or small schooling fish is compatible because it is not a conspecific. The provided sources do not establish those outcomes.
- Match the setup to the stated profile advice. Account for soft substrate, cover, dim conditions, and clean, gentle water, while recognizing that the cited recommendations do not specify numerical settings.
This approach separates the strongest shared planning detail—the 150 cm length—from the disputed volume advice and the unresolved stocking questions. It also prevents the 23 cm care-profile size from being mistaken for a reason to choose a short aquarium when the fish’s bottom-oriented behavior and the cited length guidance point toward a long setup.
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What the available figures do not tell you
The cited size and tank recommendations are profiles and database notes, not a published controlled trial comparing elephantnose fish in different aquarium footprints or volumes. They do not establish an ideal tank size through a measured survival, growth, or welfare outcome. No lifespan figure, population statistic, or care-success rate is established here, so those numbers should not be inferred from the size and tank recommendations.
In short, the evidence supports treating 23 cm as the common care-profile adult-size figure, acknowledging FishBase’s larger 35.0 cm standard-length maximum, and choosing a long aquarium rather than relying on a gallon figure alone. For a cautious tank plan, use at least 150 cm in length and treat Aquarium Lesson’s 120 US gallons or more as the conservative volume benchmark, while being explicit that another profile lists 240 L and the sources do not settle the disagreement.
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