My zebra danio had it on his mouth and it looked like a speck of salt, very similar to the white in front of the eye in the second photo.
Fortunately it was one of the slow (and frustrating) strains and he survived the disease and treatments.
How long have they had this?
Take a look at the link from post #6.
Tetra Fungus Guard and Jungle Fungus Clear are the same product. You can get JFC at Wal-Mart.