Parasite meds for a fungus....? Are you trying to kill him?
Add carbon to remove meds and do a waterchange. All your doing is stressing him more with medications that are designed not to cure fungus. If it seems to be working, thats cool I guess. But I would really keep a close eye on it. Ive never seen an infection in the nose like that. Fungus is NOT hard to treat. Clears up rather quickly, you just have to diagnose and treat quickly.
You should add salt now too.
If you see no improvement go and get a bottle of Melafix, You will be glad you did. The stuff is awesome and many hobbiests swear by it.