I have three FBT's in a 15 gallon tank. Have had them for about a year now. I just noticed that one of the toads seems to be having a problem on his little face. The skin on his muzzle if you will, has changed from the regular green/black to a slimy clear color. Is there anything I can do to help him? I highly doubt we have any vets in this area that deal with amphibians.