Corydoras similis — Smudge Spot Corydoras
Family: Callichthyidae
Origin: Brazil — Madeira River basin
Size: Up to 5 cm (2 inches)
Lifespan: 5–8 years
 
Natural Habitat
Environment: Small tributaries and slow-moving forest streams
Water Conditions: Soft, slightly acidic to neutral waters with sandy substrate and leaf litter
Temperature Range: 22–26°C (72–79°F)
Physical Description
Body Shape: Stocky, armored catfish with a slightly arched back
Coloration:
Light beige to pale tan body
Fine dark speckling throughout the body
Distinctive “smudge” or dark spot behind the dorsal fin
Fins: Mostly clear with light speckling; short and rounded
 
Aquarium Care
Tank Size: Minimum 60 litres (15 gallons) for a group
Water Parameters:
pH: 6.0–7.5
Hardness: Soft to moderately hard
Temperature: 22–26°C (72–79°F)
Water Flow: Gentle
Substrate: Soft sand preferred to protect barbels
Décor: Leaf litter, driftwood, hiding places, and shaded zones
Filtration: Gentle filtration with stable water quality
 
Diet
Type: Omnivorous bottom feeder
Preferred Foods:
Sinking pellets, algae wafers, bloodworms, and daphnia
Occasional blanched vegetables
Feeding Frequency: 1–2 times daily
 
Behavior & Tank Mates
Temperament:
Peaceful, social, and active in groups
Should be kept in shoals of at least 5–6 individuals
Compatible Tank Mates:
Other peaceful community fish (e.g., tetras, rasboras, dwarf cichlids)
Avoid large or aggressive tank mates
Behavior Notes:
Frequently sift through the substrate with barbels
Rest communally under cover during inactive hours
 
Breeding
Spawning Method: Egg layer
Breeding Conditions:
Stimulated by water changes and slightly cooler temperatures
Males chase females before she deposits eggs on glass or décor
Fry Care:
Eggs hatch in 3–5 days
Feed fry with infusoria or powdered fry food initially