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Midnight Catfish
Auchenipterichthys thoracatus
📍 South America
The Midnight Catfish (Auchenipterichthys thoracatus) is a striking nocturnal driftwood catfish from South America, known for its dark, velvety coloration and active personality. It is a member of the family Auchenipteridae and is notable for its internal fertilization, a rare trait among catfish. This species is a rewarding choice for intermediate aquarists who appreciate active, personable catfish with unique behaviors.
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Care Guide
Diet
The Midnight Catfish is an omnivore that readily accepts a variety of foods including high-quality sinking pellets, freeze-dried or frozen bloodworms, brine shrimp, and daphnia. It is most active at night, so feeding in the evening is recommended to ensure it competes well for food. Supplement its diet with occasional live foods to encourage natural foraging behavior and optimal health.
Behavior
This species is primarily nocturnal, spending daylight hours hiding among driftwood, caves, or dense vegetation, and becoming very active after lights out. It can be kept in small groups of three or more of its own kind, though males may occasionally spar with one another. It generally ignores tankmates that are too large to eat, but may prey on very small fish or shrimp.
Breeding
Breeding in captivity is uncommon but has been achieved; females undergo internal fertilization and can store sperm for extended periods. To encourage spawning, condition the pair with live foods and simulate a rainy season with slightly cooler, softer water changes. Eggs are deposited in hidden locations and the female provides minimal parental care.
Tank Mates
Similar water parameters and large enough not to be eaten
Robust, active schooling fish that coexists well with mid-level catfish
Bottom dwellers that occupy a different zone and share similar water requirements
Peaceful bottom dweller compatible with South American species
Both are nocturnal and may compete for hiding spots but generally coexist
Peaceful upper-level dweller that does not compete with this catfish
Common Diseases
Ich (White Spot Disease)
Small white spots resembling grains of salt on body and fins, flashing, lethargy
Raise temperature gradually to 28-30 C, treat with ich medication such as malachite green or copper-based treatments; catfish are sensitive so use half doses
Bacterial Infection (Columnaris)
White or grayish patches on skin, frayed fins, ulcers, rapid gill movement
Improve water quality, treat with antibacterial medications such as kanamycin or nitrofurazone
Fungal Infection
Cotton-like white or gray tufts on body or fins, lethargy, loss of appetite
Remove affected fish to a hospital tank, treat with antifungal medications such as methylene blue or clotrimazole-based products
Parasitic Worms (Internal Parasites)
Bloating, wasting despite eating, stringy white feces, lethargy
Treat with antiparasitic medications such as praziquantel or fenbendazole added to food or water
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Quick Facts
- diet
- Omnivore – accepts sinking pellets, frozen/live foods such as bloodworms, brine shrimp, and small invertebrates
- lifespan
- 5-8 years
- max size
- 11 cm (4.5 in)
- tank size
- 30 gallons minimum
- temperament
- semi-aggressive
Water it likes
- ph
- 6.0-7.5
- ammonia
- 0 ppm
- nitrate
- <20 ppm
- hardness
- 2-15 dGH
- temperature
- 72–82°F (22–28°C)