Treating "grabmegotchas" in heated systems

Something I had not thought about until recently with my growing on fish flicking. I was making a list of what I needed for the koi medicine chest as most are past use by dates - I had not realised how limited you are in using medications above 20c.
For me currently at 25c if I wanted to use pp I would have to drop the temp considerably (18c) to use it or risk killing the fish. To my mind this then poses a risk as you are now making the environment unstable creating more problems
just food for thought

UPDATE
Further to my concerns about flicking I bit the bullet caught a kikusui and done a scrape - found 5 flukes. Now the next bit should be a lesson to us all - certainly to me because I could be facing wipeout due to my haste.
Having found flukes I immediately decided to treat with Fluke m. As I was putting the last bit in I noticed my Beni Kumonryu in the corner of my eye looking a bit sorry for itself. I caught it and done a scrape and to my horror the dreaded Whitespot!!!!
Now because of my haste I am stuck - I have treated with fluke m but now need to treat for whitespot
Suggestions most welcome - except for you should have known better

Might be something on here Rich I was reading about the treatments it might tell you if they can be mixed

http://www.absolute-koi.com/subcat520.html

Oh dear 2 options take out the beni kumonryu and give it a malachite dip or do water changes to dilute out the fluke M. Or just sit it out until the fuke M is done think its active for about 5 days then a big water change check the fish for all parasites and treat accordingley.

well my Beni Kumonryu made the decision for me - couldn't bear to see it in such a sorry state so 50% water change and dosed with F&MG
Tried to seek advice from as many sources as possible - nobody could say if fluke m would react with other treatments so had to bite the bullet
monitoring closely and fingers crossed

Hope they all come through this treatment OK.

me too - i had to do something - just wish that I hadn't been so stupid and done things properly from the beginning

Well good luck I hope they all turn out okay for you Rich

unfortunately, the beni kumonryu was too far gone
the kikusui seem ok and back to their normal selves

Sorry to hear you have lost your favourite and much sought after koi, hope the others pull through.

Sorry to hear that Rich! I hope the other one pulls through okay for you