Hello everyone, I'm afraid I don't have a good update.
I'm pretty sure my goldfish has developed dropsy, and it's to the point where their belly is expanding and the scales there are "pineconing." They've got red lesions on their pelvic fins, I'm guessing from the amount of pressure the expanding has created, as well as red splotches on the right side of their cheek. Cloudy eyes, no appetite, difficulty swimming, and a tear in their caudal fin.
Prognosis doesn't seem too good, but I've completed the 5 day course of Maracyn, did a water change, and started them on Kanaplex.
I hope it's not too late, but I understand dropsy can be very fatal for fish...