Fish Disease Diagnosis
Fish Disease Treatments
Ponds, Aquaria & Filtration

"However the tail rot took about 60% of the oranda's tail.

How long does it generally take for the tail to grow out?"

The edge will look impressively smooth and healed in just a couple weeks but it will be months for the tail to regain it's original length - worse, there will always be a defect in the tail at the original "blast line" where you got the brakes on the infection.
"Koi Health & Disease" by Dr. Erik Johnson DVM is 200+ pages from Fish Health Practice - Readable by Beginners and delivered overnight from Amazon.com

Fish disease problems? Need some help? The help pages take you through the basics of the 'fish health work-up' diagnosis method and basic fish disease treatment methods.

90% of all health problems and fish deaths are caused by poor fish keeping! The key pages are essential reading for all beginners and intermediates who are serious about disease prevention.
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What if you could just get "Here's what to treat with." and no advice or education?

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Expanded Content by Dr. Erik Johnson, DrJohnson.com and Used with Permission; Frank Prince-Iles ©2009 All Rights Reserved