You used copper for a month, but the ich has only been gone for 1-1/2 wk? And what about other fish? Have they been treated? Sorry, but I can't go back and forth between all those threads to try and piece things together. Try to give a complete picture in one place [here].
If your fish does HLLE, we can deal with that, but before you return any fish to the display, I want to make sure that the ick is clear. What are your readings in the QT?