I have 3 new guppies that I just bought that have columnais(cotton fungus) I did not even see it till I got them home, I have them in a seperate tank, and lowered the water temp as much as I dare. I then added a some salt but not to much, and treated them with an fungeus bacteria treatment containing( sodium chloride, nitrofurazone,Furazolidone, potassim dichromate) But I am very worrid about two of them. One has it already spread to its mouth and gills and I don't think it can realy eat anymore. I m not so sure if she will make it . another one only has a bad patch on is side and still seems to be ok. The last one just a small patch. I need to know if there is anything else I can do to help them. 
It's a 10 gallon tank the Ph 7.2 ,he water temp. 74-75 deg. Ammonia- 0 Nitrite -0 Nitrate-20

It's a 10 gallon tank the Ph 7.2 ,he water temp. 74-75 deg. Ammonia- 0 Nitrite -0 Nitrate-20