Originally Posted by FDStation152
As I've said many times before malachite green and formalin is my standard issue medicine for my fish. Effective on ich, fungal infections, external parasites, and bacterial problems. While its not a magic bullet its always worked well for me to deal with quite a variety of problems.
Be careful with malachite green and formalin, not all fish can tolerate those two meds, and some fish need them in lower dosages to be safe.
Without a pic and water params, there isn't any med that should be suggested to treat this fish. I would also suggest stopping whatever med you are currently using, because it sounds as if it is only making the problem worse. To properly treat any illness it first has to be identified.
The person you're talking to at the LFS apparently doesn't know about fish illnesses and treatments, and doesn't sound like he knows much about fish in general, either. Can you please list the ingredients in the meds you are currently using?
The best thing you could do right now, while we're working to identify the problem is to keep the water as clean and cool as possible. Your fish isn't eating because it probably doesn't feel well. Once he starts to feel better the appetite should come back quickly. I would stop feeding for a couple of days more (he won't starve in a few days), and then offer food again slowly, only a few pellets at a time, making sure he's eating them before adding more. In a tank of that size, even a small goldfish is going to need to be cleaned a few times/wk to stay healthy. Right now, I would do 30% water changes every day, using cool, room temp water. Turning the light off for a while will help lessen the stress. Does the fish have any decorations in the tank to find hiding places? In a small tank like that a silk plant or two can do wonders.
Good Luck, we'll all help as much as we can, but we need more info in order to do so. The more you can tell us the faster we can help.