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Hello, I was wondering how one would introduce new fish to a aquarium that already has preexisting fish. Whenever I add new koi fish to my collection, most if not all of my old koi fish die from diseases. Can you explain how this process could be done correctly? Thank you.

Hello, I was wondering how one would introduce new fish to a aquarium that already has preexisting fish. Whenever I add new koi fish to my collection, most if not all of my old koi fish die from diseases. Can you explain how this process could be done correctly? Thank you.

Updated On October 15th, 2017

Pet's info: Fish | Unknown - Fish | Male | unneutered | 0.5 lbs

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Answered By Dr. Dayna, DVM, CVA

Veterinarian, Certified Veterinary Acupuncturist

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Ideally you would quarantine any new Fish in a separate aquarium for a few weeks to make sure they do not show any signs of diseases or infection. Once 2-3 weeks have passed without any signs of a problem then it is usually pretty safe to introduce to the common aquarium. Good luck and I hope they do well!

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