Hmmm...
Well the basics would be to get them out of that tank as soon as possible. Get them in clean water and a completely clean and sterile environment. Are these animals wild caught? Are they long term captives? Has there been any change recently; diet, large temperature fluctuations, etc? As Kaysie said, how often do you change the water and where does it come from? (The water that is) I can't think of any pathogen off the top of my head. That being said, I do vaguely remember symptoms kind of like this in a few of my frogs (this was like 8 years ago). I can't be sure what caused it, but at the time I believed it may have been water quality. Begin by looking at illnesses of fish, since they are better documented. I hate to be the bearer of bad news but at this point in the infection it may be too late. As is often the case with these conditions, once these serious symptoms appear the infection has already quite progressed. It still could be possible. If you are near a fish store go ask about the fishes condition, if they give you a medication consult here for dosing information. Sorry I couldn't be of more assistance.
Best of Luck,
Alex
