<https://kokosgoldfish.invisionzone.com/topic/50645-what-do-i-do-with-my-dead-goldfish/#comment-567447>
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"Potassium permanganate is excellent for disinfecting your tank of disease.  Even better than bleach solution.  It will turn a dark purple, but you can treat the color with a good dechlorinator that will clear it before you have to dump the tank water.  Wear rubber gloves. "
<https://kokosgoldfish.invisionzone.com/topic/50645-what-do-i-do-with-my-dead-goldfish/>