Simply Koi and More Koi

Thanks Duncan, I'm still relatively new to this koi keeping, I am more than happy to go with what you recommend and use the full dose. It just threw me when it stated what it does on the packaging, and as this was the first time I had used MG I just wanted to be sure.
Appreciate the help.

Duncan, the MG I have from Kusuri states treating at half does if used with Formalin. With this in mind in your opinion should I stick to what it states on the bottle or go with you recommendations?

Duncan, sorry another quick question for you... Before I spotted the costia, I had only noticed Chilidonella so had treated this with Formalin. 24 hours later I had scraped more fish and then found the costia, at this point I bought some MG and then put this in at half dose as per the instructions o...

Duncan apart from when I do the water changes to control nitrite is am in between 12-14 degrees. When I water change it drops to about 11 degrees.
The name is Carl by the way.

Good morning everyone, first post here... I have 8 koi that I have moved into a quarantine vat from a koi show vat. The reason for moving these is that I started to extend my pond before the weather really took a turn for the worse. The water was close to freezing point due to being so exposed above...