I'd have to agree with "Whatcaneyedo". Try your hardest to keep your water quality in check and never use chemicals to try and correct nature because generally whatever problem you address by using chemicals will only be side tracked and often come back; a lot of times even worse than the first time. Some fish are just weaker than other others (immune system is not as strong) but it's safe to say if all parameters are in check and fish aren't stressing eachother out most sicknesses will just run their course similar to the swine flu :S (No need to spend millions on vaccines). Another good asset is a gang of cleaner shrimp and a cleaner wrasse.
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