How long has it been like this? How long have you had the fish? Has it improved since you posted? I don't know of many people who feel comfortable adding medication directly to their display tank, but there's a good chance the medication tastes awful to fish (have you ever tried chewing an aspirin?), so getting them to eat it might be challenging in a display tank. Also, all uneaten food is now delivering medication to your entire system.
The first question you need answered is whether or not the medication is even necessary. If you've had this fish for months, have added no other new fish, and this suddenly developed, I would be more inclined to wait and see. If this is a relatively new fish that wasn't quarantined, it's perhaps parasites. However, which parasite and which medication are much harder questions to answer.
But yes, as a general rule of thumb it's good to treat all illnesses in a separate QT tank. You have much more control in that circumstance, your fish is not going to be competing for resources with anyone, and you're not exposing your main system to chemicals that could affect everything.
Repashy makes a powdered food that you constitute in to a a solid gel yourself at home. It's much easier to mix medications in to that kind of food in known quantities, but you might have had to have trained your fish to eat that brand before you use it to attempt to deliver a medication. I'm not sure I would try it myself as attempting to give an internal dosage to a fish that eats however much of anything that it wants runs the real risk of over or under-dosing the medication.
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