Wait till the LFS finishes the copper treatment on the fish you want to buy, then ask the LFS to transfer the fish to a non-copper tank and wait another week. make sure the fish eats before you pay. Copper can affect appetite of a fish.
oh yeah, don't put LFS water in your tank, regardless if you know it has copper or not. Many fish from different regions share the same water. You don't know what's in the water.
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