Species description

Care, breeding and tankmates

Fish profile

Temperament

Semi-aggressive

This catfish is exceptionally peaceful and non-aggressive, making it a perfect candidate for community aquariums. However, since they are opportunistic nocturnal feeders, they may swallow very small fry or tiny nano fish if they can fit inside their mouths. They are highly secretive and nocturnal, spending daylight hours completely hidden and only becoming active once the aquarium lights have been turned off.

Diet

Omnivore

Amblydoras hancockii is an omnivorous and opportunistic scavenger that will readily accept a wide variety of foods reaching the substrate. Their diet should consist of high-quality sinking catfish pellets, algae wafers, and regular offerings of live or frozen foods such as bloodworms, tubifex, and brine shrimp. Because they feed mainly in darkness, it is crucial to add food to the aquarium just before or after turning off the lights.

Life expectancy

8-15 years

Under proper aquarium care and stable water parameters, Amblydoras hancockii is a remarkably long-lived species, typical of the hardy Doradidae family. They generally live between 8 and 12 years in captivity, but with an optimal diet and excellent husbandry, they can easily reach or exceed 15 years. Maintaining stable water chemistry and avoiding stressful tankmates are key factors in maximizing their lifespan.

Sex ratio

Group

This species exhibits highly gregarious behavior and is very peaceful toward its own kind, meaning it should ideally be kept in a group of at least three or four individuals. There is no strict male-to-female ratio required, as they do not show territorial or intraspecific aggression in the aquarium. Keeping them in a group helps them feel secure, encourages natural behaviors, and significantly reduces the shyness and stress associated with solitary keeping.

Feeding frequency

Twice daily

It is recommended to feed this catfish once per day, preferably in the evening or shortly after the aquarium lights have been turned off to align with their nocturnal activity. Feeding them during the day is generally unsuccessful as they will remain hidden in their caves, allowing other tankmates to consume the food. Ensuring a daily nocturnal feeding routine helps keep them healthy, active, and well-nourished.

Bioload

Low to Medium

The biological load generated by Amblydoras hancockii is relatively low to medium due to their small adult size of 7.5 to 10 cm and their largely sedentary lifestyle. However, because they are bottom-dwelling scavengers that feed on organic debris, they require an efficient filtration system to prevent the accumulation of toxic compounds. A soft, sandy substrate combined with regular mechanical and biological filtration maintenance is essential to process their waste and keep the water clean.

Flow

Stagnant

In their natural habitat, these catfish inhabit slow-moving or standing waters, such as small creeks, swamps, and flooded forest areas. Consequently, they prefer a weak to moderate water flow in the aquarium, and strong, direct currents should be avoided as they can stress the fish. Adequate biological filtration should be maintained while keeping the bottom areas calm and free of excessive water movement.

Jump risk

No

Reproduction

Oviparous

Breeding Amblydoras hancockii in captivity is extremely difficult and has not yet been reliably achieved in home aquaria. In nature, they are believed to construct bubble nests among floating vegetation and leaf debris, which are subsequently guarded by the male until the fry hatch. To encourage potential spawning behavior, aquarists recommend using soft, acidic water, providing floating plants, and simulating a rainy season with cool water changes.

Compatibility & tankmates

This catfish is highly compatible with a wide variety of peaceful, medium-sized tankmates such as tetras, peaceful cichlids, Corydoras, and loricariids. However, very small species or tiny shrimp should be avoided as they might be consumed during the night. Additionally, aggressive or highly territorial tankmates should not be housed with them to prevent stress and keep these shy bottom dwellers safe.

Tank level

Bottom

Amblydoras hancockii is a strictly demersal fish that spends almost all of its time on or just above the aquarium substrate. During the daytime, they will remain tightly squeezed into dark caves, rock crevices, PVC pipes, or hidden underneath driftwood and leaf litter. They will only venture out into the open or occasionally swim into the mid-water levels during the night when the lights are completely turned off to scavenge for food.