The Congo Bichir is a prehistoric-looking, bottom-dwelling monster fish and one of the largest species in the Polypteridae family. They are obligate air-breathers and ambush predators that will eagerly consume any tankmate small enough to fit in their surprisingly large mouths. Due to their massive adult size, they require extremely large custom aquariums, heavy filtration, and a tight-fitting lid to prevent escapes.
Congo Bichir At a Glance
Congo Bichir Tank Requirements
Will Congo Bichir fit in your tank?
Care guides tell you what Congo Bichir needs, the next question is whether your tank can safely provide it. Test Congo Bichir against your tank size, maintenance needs, and the fish you already keep before you buy.
Useful setup supplies
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Congo Bichir Water Parameters
Water care products
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Congo Bichir Temperament & Compatibility
Congo Bichir Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Adult (Standard)
Fully grown Congo Bichir. Demands a massive footprint (minimum 6.5ft/200cm length) and heavy filtration to handle its extreme bioload. Tankmates must be high-bodied and large enough to avoid becoming a meal.
Same care requirements as the base species
Also known as: Full Grown, Adult Bichir
Juvenile (Grow-out)
Young Congo Bichir. While they can be temporarily housed in smaller aquariums, they grow incredibly fast and will quickly require a massive tank upgrade. Will eat smaller tankmates.
Differs in 4 traits from base species
Also known as: Baby Bichir, Juvenile Congo
Congo Bichir Care Guide Summary
The Congo Bichir, scientifically known as Polypterus endlicheri congicus, belongs to the Oddballs family group. Adults reach a maximum size of approximately 75 cm and have a eel body shape with a moderate growth rate. Classified as aggressive, this species primarily occupies the bottom zone of the aquarium and produces a extreme level of biological waste.
To thrive, the Congo Bichir requires a freshwater only aquarium with a minimum volume of 800 litres and a tank length of at least 200 cm. Water temperature should be maintained between 24°C and 30°C, with a pH range of 6.5–8 and a general hardness of 5–20 dGH. A moderate water flow is preferred.
Due to its specialist needs, the Congo Bichir is best suited for fishkeepers who can provide a carefully planned setup. This species is available in 2 varieties: Adult (Standard) 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.
Congo Bichir Habitat Setup
When setting up an aquarium for the Congo Bichir, a moderate water flow best suits their natural preferences. Because this species occupies the bottom zone, the aquarium layout should prioritise 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, and 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.
Congo Bichir Compatibility Notes
Classified as aggressive, the Congo Bichir is adaptable and can be kept singly or in a small group, offering flexibility when planning a community tank. When choosing tankmates, any fish small enough to fit in its mouth will likely be eaten and ornamental shrimp are not safe companions. Selecting tankmates that favour different water layers from the bottom zone can help reduce competition and territorial overlap.
Congo Bichir Feeding & Diet Considerations
The Congo Bichir is a predatory species that will readily consume small fish, so nano or bite-sized tankmates should be avoided, will hunt and eat ornamental shrimp, making it unsuitable for shrimp-focused setups, and is primarily active at dusk and dawn, so offering food shortly after lights-off ensures it receives adequate nutrition.
Feeding products
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Frequently Asked Questions About Congo Bichir
How big does Congo Bichir get?
Congo Bichir (Polypterus endlicheri congicus) typically reaches a maximum adult size of approximately 75 cm. They have a eel body shape and a moderate growth rate.
What tank size does Congo Bichir need?
A minimum aquarium volume of 800 litres and a tank length of at least 200 cm are recommended for Congo Bichir. This ensures enough swimming space and helps maintain stable water conditions.
What water parameters does Congo Bichir need?
Congo Bichir thrives in freshwater only conditions with a temperature range of 24–30°C, a pH between 6.5 and 8, and a general hardness of 5–20 dGH. A moderate water flow is preferred.
Is Congo Bichir peaceful or aggressive?
Congo Bichir is classified as aggressive with an aggression score of 7 out of 10. Careful tankmate selection is essential to avoid conflict.
Can Congo Bichir live alone?
Yes, Congo Bichir can be kept singly or in a group. They are flexible and adapt well to both setups.
Is Congo Bichir safe with shrimp?
No. Congo Bichir is known to eat ornamental shrimp and is not recommended for shrimp tanks. Even larger shrimp species like Amano Shrimp may be at risk.
Does Congo Bichir have any special tank requirements?
Yes. Congo Bichir benefits from sand (sifters), smooth gravel (sensitive barbels), and driftwood (digestion/hiding) in the aquarium. These features help replicate their natural habitat and promote overall health and well-being.
Does Congo Bichir need a lid on the tank?
Yes. Congo Bichir 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.
Plants That Suit Congo Bichir
These plants pair well with Congo Bichir based on shared water preferences, layout fit, and how likely they are to hold up in the same aquarium.
African Onion Plant
Crinum calamistratum
Afzel's Anubias
Anubias afzelii
Amazon Sword
Echinodorus amazonicus
Anacharis
Egeria densa
Anubias Barteri
Anubias barteri
Ashy Pipewort
Eriocaulon cinereum
Fish Similar to Congo Bichir
Delhezi Bichir (Armored Bichir)
Polypterus delhezi
An ancient, air-breathing predatory fish from the Congo River basin. Known for its distinct black vertical bands and dinosaur-like dorsal finlets. They are bottom-dwelling ambush predators with poor eyesight but an excellent sense of smell. While generally peaceful with similarly sized or larger fish, they are opportunistic piscivores and will eat anything that fits into their surprisingly large mouths.
Senegal Bichir
Polypterus senegalus
A fascinating, prehistoric-looking predatory fish often called the 'Dinosaur Eel'. They possess a modified swim bladder acting as a lung and must have access to the surface to breathe. Though peaceful with large, deep-bodied tank mates, they are strictly carnivorous and will consume any fish or invertebrate that fits in their mouths. Excellent escape artists; a heavy, tight-fitting lid is mandatory.
Chao Phraya Giant Catfish (Paroon Shark)
Pangasius sanitwongsei
An apex predator native to the Mekong and Chao Phraya basins. This true 'monster fish' is completely unsuitable for home aquariums. They grow to massive proportions, are highly active, and easily startled—often severely injuring themselves by crashing into tank walls. They possess a massive appetite and are highly piscivorous, consuming any tank mate that fits in their mouth.
Buettikoferi Bichir
Polypterus palmas buettikoferi
The Buettikoferi Bichir (often sold as the Gold Dust Bichir) is a fascinating ancient fish native to West Africa. Like all bichirs, it possesses a modified swim bladder acting as a primitive lung, requiring a small air gap at the surface to breathe atmospheric air. They are peaceful towards similarly-sized fish but are highly predatory nocturnal ambushers that will consume anything that fits in their mouths.
Congo Puffer (Potato Puffer)
Tetraodon miurus
An ambush predator native to the Congo River basin. Affectionately known as the 'Potato Puffer' due to its lumpy, inactive appearance when buried. It requires deep, soft sand to bury itself and wait for prey. It is highly aggressive, strictly carnivorous, and must be kept solitary as it will bite or consume almost any other fish.
Buccochromis lepturus
Buccochromis lepturus
A massive, open-water predator native to Lake Malawi. They are pelagic pursuit hunters that will consume any fish small enough to fit in their mouths. Due to their enormous adult size and extreme swimming speed, they require exceptionally large aquariums. They should only be housed with other large, robust Malawi cichlids.