subject: Getting To Know Red Koi Fish [print this page] When buying red koi fish, look for healthy fish that is brightly colored, with erect fins, clear eyes, and scales intact. Younger koi of up to 3-4 inches long are usually less expensive. Older red koi fish of about two feet can cost anything in the range of $1000 to $10,000. Undoubtedly, red koi fish will and a brilliant splash of color to your koi pond. With proper