Koi (Cyprinus rubrofuscus) is a intermediate-care freshwater species. Minimum tank: 1,000 gallon pond. Adult size: 24-36 inches. Diet: omnivore. Lifespan: 25-50 years. Requires stable water parameters and an established tank. Not recommended as a first species, but accessible to anyone with 3-6 months of aquarium experience. Browse Koi care guide for the full breakdown including water parameters, tankmate compatibility, and feeding schedule.
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