So sorry to hear, hugs to you. You are doing everything you can and I admire you for taking care of these poor frogs which were not being properly cared for before you got them, and that is probably what caused this illness. I do not know how to answer your question about the Lamisil, never had to medicate our ADFrogs. Is the other frog showing any signs of illness? Is that disease contagious? What causes that disease? Things you need to research so you can decide what to do next. Wish I could be of more help, but first you can look at the other frog for signs of illness like, not eating, hiding all of the time, staying at the top of the tank all of the time (normally they just go up for a quick breath of air), visible signs of sores, etc. If froggie seems ok with all of these things, just having a clean environment may be all it needs, I am scared to use too much medicine unless they really need it, not sure how they will react to it.