HotRocks
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My Tank Thread
They do the same thing here in the states.Im not sure about the United States but in Australia the LFS dose copper ( cupramine ) at .2ppm to their tanks. They obviously do This to stave off any disease from killing their stock but not enough to take the risk of copper poisioning. When the buyer gets the fish home and into a tank QT or otherwise without copper the parasite can then multiply and kill before we know it.
My favorite LFS store owner is well versed in disease and treats if fish are symptomatic. He admittedly runs cupramine in his systems at .25ppm and openly speaks about it. He would sell fully QTd fish, but the market here doesn't allow him. People would just drive up the street 5 miles and purchase fish elsewhere because his cost would be higher than everyone else. I understand that from a business standpoint.
So the safest way is to QT your own fish period. IMO.