Corydoras similis, commonly known as the Smudge Spot Cory or Violet Cory, is a peaceful and attractive bottom-dwelling catfish native to South America, particularly the Rio Madeira basin in Brazil. Here's a comprehensive care guide to help you keep them healthy and happy in your aquarium:

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Species Overview

• Size: Up to 4–6 cm (1.6–2.4 inches)
• Lifespan: 5–7 years with proper care
• Temperament: Peaceful and social; best kept in groups of 6 or more
• Tank Level: Bottom dweller
• Coloration: Cream base with brown spots and a violet-blue smudge near the dorsal fin 

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Tank Setup

• Minimum Tank Size: 15 gallons for a group of 6
• Substrate: Fine sand or smooth gravel to protect their delicate barbels
• Decor: Driftwood, caves, and live or artificial plants for hiding
• Lighting: Moderate; mimic natural day-night cycles
• Filtration: Gentle flow; avoid strong currents
• Water Changes: 10–25% weekly to maintain water quality 

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🌡️ Water Parameters

• Temperature: 20–27°C (68–81°F)
• pH: 5.5–7.5
• Hardness: 4–20 dGH
• Ammonia/Nitrite: 0 ppm (as with all freshwater fish)

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🍽️ Diet

• Type: Omnivorous
• Staple Foods: Sinking pellets, algae wafers, high-quality flakes
• Treats: Bloodworms, brine shrimp, daphnia (1–2 times per week)
• Feeding Time: Preferably in the evening when they are more active 

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Breeding

• Spawning Type: Egg layers
• Setup: Separate breeding tank with soft, acidic water and broad-leaved plants
• Trigger: Cooler water changes and live food conditioning
• Egg Care: Remove adults post-spawning to prevent egg predation
• Fry Care: Feed infusoria or powdered fry food, then transition to baby brine shrimp 

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Tank Mates

• Ideal Companions:
  • Neon Tetras
  • Harlequin Rasboras
  • Rummy Nose Tetras
  • Bolivian Rams
  • Pearl Gouramis
  • Cherry Barbs
• Avoid: Aggressive or large predatory fish 

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