Hi

I had 4 African dwarf frogs. I lost 1 yesterday who started just floating around the top and falling back down on his back, then i noticed another ones skin looks like its rotting away and has his little webs missing, hes now at the top looking very poorly, i have 2 others 1 is really pale but they both look okay for now, is it fungus? i started medicating with protozin yesterday, it is really upsetting me as i dont know what it is and dont want to lose the rest