Loaches typically respond badly to many meds and to salt. But I have never had issues with botia loaches and heat.
And I should add that you might want to invest in a quarantine; I know from experience treating a big tank for anything is no fun
I have a spare 10 gallon i'm using to quarantine the plants that were in my 55 the temp is at 84 degrees will the loaches be fine in there? While I dose the 55 with salt because I've already started the salt treatment. It doesn't have a filter