White Spot?

So I really do think the baby koi have white spot. Several of the black ones have tiny spots all over them and some of the orange ones too.

I treated last night with 40ml of Machalite green, for 800gal but I can’t turn my UV off(stupid electrition wired it to the filter pump) I really need to know what effect this will have on the treatment?

Also if this doesn’t clear up after a while, should I try something else? I don’t want to nuke it by any means because I don’t know how hardy baby koi are…

Any help really appreciated, this is a pretty testing time for me.

Dawn