The Black Venezuelan Corydoras (Corydoras schultzei, often commercially reclassified as Osteogaster schultzei) is a striking and highly sought-after freshwater catfish celebrated for its deep, velvety jet-black to dark maroon body. Despite its common name, this unique colour morph is actually a selectively line-bred variant developed by German aquarists in the 1990s from the Gold Flash Corydoras, which is native to Peru—not Venezuela.

Key Characteristics:

• Colouration: A uniform charcoal-to-black base often accented by deep bronze, dark brown, or orange highlights that develop more vibrancy as they mature. Their depth of colour is highly environmental; keeping them on dark sand substrates brings out their deepest, richest blacks.
• Behaviour: They are incredibly peaceful, active, and social bottom-dwellers. They are famous for their endearing group behaviours, including schooling, synchronized foraging, and rapidly darting to the surface to gulp air (intestinal breathing).
• Size & Lifespan: They typically reach an adult size of about 6 to 7.5 cm and can live up to 6 years under proper care.

Tank Setup & Parameters:

• Substrate: A soft sand substrate is mandatory. Coarse gravel or sharp rocks will erode their highly sensitive sensory barbels, leading to infections.
• Tank Size: Minimum 50 to 60 litres for a single-species group, though a larger aquarium is recommended for a community setup. Keep an open water surface gap so they can safely breathe air.
• Environment: Incorporate plenty of driftwood, caves, and live plants (such as mosses or ferns) to create shaded zones and resting spots.
• Water Conditions: Temperature of 22–28°C, pH of 6.0–7.5, and clean, well-oxygenated water with a gentle flow.

• Schooling: They must be kept in groups of at least 5 to 6+ individuals. Isolating them or keeping them in pairs causes immense stress and hiding behaviour.
• Diet: As natural omnivorous foragers, they scavenge the aquarium floor but should not be left to survive on waste alone. Provide high-quality sinking carnivore pellets, catfish wafers, and regular treats of protein-rich live or frozen foods like bloodworms, blackworms, and brine shrimp.
• Tank Mates: Excellent additions to peaceful community tanks. They pair beautifully with nano fish, tetras, rasboras, dwarf cichlids, and angelfish.

Breeding Quick Facts:

They are relatively easy to breed at home. Spawning is traditionally triggered by a drop in barometric pressure combined with a large, cool water change to mimic the arrival of the rainy season. The parents perform a classic “T-position” spawning layout, depositing highly adhesive eggs onto the glass corners or stiff plants. Eggs should be removed to a separate container with circulation to hatch after 3 to 4 days, as adults will readily eat their own eggs and fry.