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As I mentioned, it can take 3 days for copper to start to work. You'll see a gradually reduction in number of spots, then the fish will have just a general cloudiness to their skin. You'll want to keep the copper up for 30 days. Some people say 14 days, but the logic of that is flawed: copper doesn't kill the tomont stage and those stages can survive for 30+ days, so 14 days just isn't long enough.
the 14 days comes from if you transfer the fish to a new sterile tank. At that point all trophonts will have fallen off fish.
Op if you did add tang to dt make sure to restart the 30 day clock