After a potassium permanganate treatment of six to eight hours on Day One - if it hasn't converted from purple to amber, you can inactivate with peroxide,

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Potassium Permanganate Dosing

Is there a criteria to determine whether I should perform Day 4, or even Days 8 and 12

....if the color does not change for at least 8 hours for Day 1, should I go on to day 4 at all?

...If the color does not change after 8 hours for any day; shouldn't I add the hydrogen peroxide to stop the process and then turn on the filtration system ?

Yes you should do day four and eight because even though "Treatment One" lasted plenty long enough, it didn't kill Fluke eggs or embryos. These have to be interecepted on those subsequent days.

After a potassium permanganate treatment of six to eight hours on Day One - if it hasn't converted from purple to amber, you can inactivate with peroxide, and probably should.

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.

PondCrisis.com
If you have a koi, pond or fish problem, this site takes you through twenty easy questions and at the end you know what you need to fix in your pond to create restored Koi health.

KoiCrisis.com
Koi Crisis has a symptoms chart by system you can choose the symptom by fish part, and resolve a lot of Koi pond fish problems or at least, learn about them understand how to remedy them.

Koi Beginner
VIDEOS!! Once you've leapfrogged through this YouTube hosted tutorial you will have a solid, working concept of the Koi hobby and what it's all about. This is done just about exclusively with video and very little written material.