How is he acting?
I'd say move him to a hospital tank and treat him with melafix. That's what I did when my goldie was injured and he is healing wonderfully.
One more thing, do you have a pleco with your goldies?
Yes he's alive and swimming and eating but I've isolated him from everyone else for now. But I don't have any of that melafix stuff or anything like that. Just fungus and parasite clear and quick cure.
My med tank hasn't been cleaned in awhile (haven't used it in months and I got lazy) and it only has an undergravel filter. He's in a big bowl/cup thing right now.
I'm really, really worried because of all my fish, my goldies are my most precious. And I won't be able to get any melafix until Monday unless I can convince my parents to let me go into town tomorrow (difficult because they don't think such things are really that much of an emergency).
My dad suggested putting a very tiny drop of antibiotic cream in the water but that sounds to iffy to me.