Help With Bronze Catfish

[matthewkeogh50]

Hi all i noticed that one of my bronze catfish has a fungal infection (its a huge white spot on his head with a fluff like substance growing out of it) it has grown on him very fast i bought some NT labs anti white spot and fungus it seemed to work but then my neon's started attacking the bronze i have put him in a separate tank upstairs along with my other 2 corys he seems ok now the fungus seems to be resistant to the treatment any help please i need this as fast as you can 
 
by the way i do a 10% water change every Sunday
 
the bug tank down stairs is a juwel rio 125
and the tank i have him in now is a fluval edge 23L
 
Thanks Matthew