koi fish tank size guide in building a koi fish aquarium

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Koi Fish Tank Size Keep mature koi in an outdoor pond of at least 3 feet deep, with at least 50 gallons of water per fish. Young koi can be kept indoors in an aquarium of at least 29 gallons. A good rule of thumb to go by for ponds or larger koi tanks is 250-gallons per… Continue reading koi fish tank size guide in building a koi fish aquarium