It's completely normal for newly introduced small koi to hide for days or weeks. They're vulnerable to predators and intimidated by larger koi.
Small koi graze on biofilm, algae, and micro-invertebrates on pond walls and bottom—they often get more nutrition this way than from pellets.
If they remain hidden >3 weeks, show emaciation (sunken eyes, concave belly), or develop lesions, investigate water quality and disease.
For 3 large koi + 4 small, you need >2,000 gallons. If your pond is smaller, overcrowding stress will persist.
Patience and targeted feeding will bring your babies out in time.
Growing Florist-Size Carnations from Seed
When to Move Koi to a Larger Pond: Space & Depth Guidelines
Basic Care for New Koi & Goldfish (3 Months Old)
Koi and Goldfish Jumping Out of Pond: Causes and Fixes
Goldfish and Koi Attacking Each Other in Overcrowded Winter Tank
Ulcers on Goldfish and Koi: Aeromonas Infection and Treatment
Multiple Koi Deaths: Tannins, Plant Fertilizer, and Gill Issues
Butterfly Koi Lethargic After New Koi Added
Recurring Red Rash on Koi in Overstocked Tank: Parasites, Bacteria, or Stress?
Ghost Koi & Goldfish Compatibility: Behavior, Stocking & Predator Awareness
Wintering Koi in Minnesota: Why a Fish Bowl Failed & How to Do It Right
Building a Koi Pond: Depth Requirements and Planting Water Lilies
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