Can you post a picture of YOUR frog? I would not be so quick to medicate if the only evidence of fungus is pale green spots. Honestly I would be more inclined to think that those spots have something to do with temperature if they look like the ones in that photo you posted. Are the spots raised? Are they in the same spots for more then 24hrs? Try placing your frog in a light green area of its enclosure and see if his colors change. Also what are your temps and humidity at?