Just because they come from somewhere other than a LFS doesn't mean that the fish arn't heathly. In fact a lot of the time at the LFS the fish are stressed or in poorer condition (60 clowns in a 30G for example).
Copper treatment is a last resort treatment and as Denny said that tank shouldn't be used for anything else other than copper treatments. The copper is a poision that can leach out and affect other fish/inverts in the future.
Sorry for the loss, its never fun.
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