Corydoras pygmaeus — Pygmy Corydoras
Family: Callichthyidae
Origin: South America — Madeira River basin (Brazil)
Size: Up to 3 cm (1.2 inches)
Lifespan: 3–5 years
 
Natural Habitat
Environment: Small tributaries and flooded forest areas
Water Conditions: Soft, slightly acidic to neutral, slow-moving water
Temperature Range: 22–28°C (72–82°F)
 
Physical Description
Body Shape: Small, slender, and streamlined
Coloration:
Silvery-gray body with a prominent horizontal black stripe from snout to tail
Slight greenish iridescence on flanks
Fins: Transparent and delicate
 
Aquarium Care
Tank Size: Minimum 40 litres (10 gallons), best in a group of 8+
Water Parameters:
pH: 6.0–7.5
Hardness: Soft to moderately hard
Temperature: 22–28°C (72–82°F)
Water Flow: Gentle
Substrate: Fine sand or smooth gravel to protect delicate barbels
Décor: Plants, driftwood, leaf litter, and shaded areas
Filtration: Gentle filtration with clean, well-oxygenated water
 
Diet
Type: Omnivorous micro-bottom feeder
Preferred Foods:
Micro pellets, crushed flakes, sinking wafers
Live or frozen foods (baby brine shrimp, daphnia, microworms)
Feeding Frequency: 1–2 times daily
 
Behavior & Tank Mates
Temperament:
Peaceful and social; best kept in schools of 8 or more
Active in both bottom and mid-water zones — unusual for Corydoras
Compatible Tank Mates:
Other peaceful nano species (e.g., rasboras, small tetras, Otocinclus)
Ideal for nano and community tanks
Behavior Notes:
Often seen swimming in open water in small groups
Very active and inquisitive
 
Breeding
Spawning Method: Egg layer
Breeding Conditions:
Spawns on aquarium glass, plants, or décor
Condition with live foods and cool water changes
Fry Care:
Eggs hatch in ~3–4 days
Feed infusoria or powdered fry food; grow quickly in clean conditions