A highly intelligent, nocturnal oddball native to African rivers. They navigate, communicate, and hunt using a weak electrical field generated from a specialized organ in their tail and a highly sensitive 'trunk' (a specialized chin appendage). A soft sand substrate is absolutely mandatory to prevent their trunk from being damaged by abrasion. They are notoriously aggressive toward conspecifics unless kept in very large shoals in massive aquariums.
At a Glance
Tank Requirements
Water Parameters
Temperament & Compatibility
Available Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Standard / Adult
The fully grown adult form. Requires a minimum 4-foot (120cm) tank to establish its electrical territory. Extremely sensitive to water quality and medications.
Differs in 1 trait from base species
Also known as: Adult Elephantnose
Juvenile (Grow-out)
Typical sale size in local fish stores. While they can temporarily be housed in smaller aquariums, they require a fast upgrade to a permanent 4-foot tank. Soft sand is still mandatory.
Differs in 4 traits from base species
Also known as: Baby Elephant Nose
Peter's Elephantnose Fish Care Guide Summary
The Peter's Elephantnose Fish, scientifically known as Gnathonemus petersii, belongs to the Oddballs family group. Adults reach a maximum size of approximately 25 cm and have a compressed body shape with a moderate growth rate. Classified as mostly peaceful, this species primarily occupies the bottom and mid-level zones of the aquarium and produces a medium level of biological waste.
To thrive, the Peter's Elephantnose Fish 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 6–7.5 and a general hardness of 2–15 dGH. A moderate water flow is preferred.
Due to its specialist needs, the Peter's Elephantnose Fish is best suited for fishkeepers who can provide a carefully planned setup. This species is available in 2 varieties: Standard / Adult and Juvenile (Grow-out). Each may differ slightly in size, temperament, or care needs, so it is worth checking the specific requirements of the variety you plan to keep.
Peter's Elephantnose Fish Habitat Setup
When setting up an aquarium for the Peter's Elephantnose Fish, a moderate water flow best suits their natural preferences. Because this species occupies the bottom and mid-level zones, the aquarium layout should prioritise open swimming space in the centre of the tank for free movement and sufficient floor space with hiding spots among rocks, wood, or dense planting. Useful additions include a sand substrate to accommodate their sifting behaviour, smooth gravel or rounded substrate to protect their sensitive barbels, driftwood, which can serve as both a hiding place and a dietary supplement, and light plant coverage for partial shade. Keepers should note that a tight-fitting lid is essential, as this species is a known jumper.
Peter's Elephantnose Fish Compatibility Notes
Classified as mostly peaceful, the Peter's Elephantnose Fish is adaptable and can be kept singly or in a small group, offering flexibility when planning a community tank. When choosing tankmates, conspecific aggression can be intense, especially in smaller tanks and boisterous or fast-moving tankmates may cause this species undue stress. Selecting tankmates that favour different water layers from the bottom and mid-level zones can help reduce competition and territorial overlap.
Frequently Asked Questions About Peter's Elephantnose Fish
How big does Peter's Elephantnose Fish get?+
What tank size does Peter's Elephantnose Fish need?+
What water parameters does Peter's Elephantnose Fish need?+
Is Peter's Elephantnose Fish peaceful or aggressive?+
Can Peter's Elephantnose Fish live alone?+
Does Peter's Elephantnose Fish have any special tank requirements?+
Does Peter's Elephantnose Fish need a lid on the tank?+
Similar Species
Panda Corydoras
Corydoras panda
A highly popular, peaceful schooling catfish easily identified by its black eye patches and spotted dorsal/tail fins, resembling a giant panda. Native to the cooler waters of the Ucayali river system in Peru, they require slightly lower temperatures than many standard tropical community fish. They are strict bottom-dwellers that sift through the substrate for food.
Black Ghost Knifefish
Apteronotus albifrons
A fascinating nocturnal predator native to the Amazon basin. It lacks a dorsal fin and moves via a continuous undulating ventral fin, allowing it to swim backwards as easily as forwards. It generates a weak electrical field to navigate and hunt in the dark. Scaleless and highly sensitive to medications, it requires smooth hiding places (like PVC pipes or smooth driftwood). Will consume any fish small enough to fit in its surprisingly large mouth.
African Butterfly Fish
Pantodon buchholzi
A fascinating, prehistoric-looking surface dweller native to the slow-moving waters of West Africa. They are strictly top-dwelling ambush predators with a completely flat back and upturned mouth designed to hunt insects and small fish. A tight-fitting lid is absolutely mandatory as they are exceptional jumpers capable of gliding above the water.
Peacock Gudgeon
Tateurndina ocellicauda
A stunning, peaceful freshwater sleeper goby from Papua New Guinea. Known for their vibrant blue, red, and yellow colors, they are excellent nano-tank inhabitants. They are not true gobies (they lack fused pelvic fins) and are exclusively freshwater. They prefer slow-moving water, dense vegetation, and small caves (like PVC pipes or smooth stones) for spawning.
Beckford's Pencilfish
Nannostomus beckfordi
A peaceful, slender schooling fish native to the sluggish rivers and swamps of South America. They are famous for the males' harmless but spectacular lateral sparring displays. They require heavily planted aquariums with gentle flow and make excellent tank mates for other peaceful, soft-water species. A tight-fitting lid is essential as they are known to be proficient jumpers.
Leopard Bushfish (Ctenopoma)
Ctenopoma acutirostre
A fascinating, ancient African anabantoid that mimics a dead leaf to ambush prey. They possess a surprisingly large, extendable mouth. While slow-moving and generally peaceful towards fish too large to swallow, they are efficient predators of small fish and invertebrates. They are crepuscular (active at twilight) and require structure (wood/plants) to feel secure.