Update: The loach appears to be doing fine with just raised temperature and a tiny pinch of aquarium salt. It looks like the ick has cleared up. It's been about a week and a half since the ick went away, but every other day since then up until about four days ago it would get what appeared to be a single ick spot, but those could have been particles of something else that settled on the fish's skin. I have not seen any kind of particles/spots on the loach for several days. Is it about time to turn down the temp?
How much longer should I keep it isolated? I can't wait to get this little guy into the other tank with others of his kind. The loach is active, constantly foraging and eating well. I am sure it has no other health problems besides the recent ick.
Incidentally, the rotala rotundifolia and wisteria stems in this tank have put up with the heat very well. I guess these won't melt if there is a heat wave this summer, like my anacharis did during a heat wave last year. (I really need some AC