There is no proof of any kind that garlic will help a sick fish. IMO it may help entice them to eat but will not "cure" any disease. It is not a natural part of a marine fish diet however it seems to get thrown out there to cure everything from coughs, colds, sore aholes and pimples. If your fish is eating it probably isn't necessary. I do use garlic extract in my fish food but only because they seem to like it and it keeps everyone eating vigorously. From you description I am not sure what is the matter with your fish and I hope it pulls through for you. If it is eating I would suggest just keeping your water quality high and providing a stress free environment. If someone can identify the disease there may me a specific treatment that may help.
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