If you have a fish that is sick, I suppose you need to remove it, if you have done everything else you can to solve the problem. So having an empty tank and some spare parts around is good insurance.
Quaratine was always more of an issue with me, when I was more actively stocking my tanks. I usually had an established small tank somewhere so I could put the fish in there to get it eating and monitor it. As a result, they didn't get sick, so there was no need to treat them.
I haven't quaratined my last specimens, but that's not necessarily a good thing. Maybe I was just lucky.
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