They will have to stay in the tank, as even if you issolate them in a container at the top of the tank there not enough 02 with the med in the water, it needs an airstone in there.
Okay, i gave an epson salt bath like you said......but today ....i have a guppy, angel, the other harlequin, red eyed tetra all with fat tums too. I give up..help anyone!