Wondering how risky it would be to add a yellow tang to a QT that has copper power already at 2.4? Reason I ask is because I just finished tearing a tank apart to catch a Niger that started munching on all my softies. The store I'm taking to has a really nice yellow tank I would like to get. I have a yellow in QT now but copper has reached therapeutic level but only 2 days ago so I would like to add it and just reset the timer. Is this a bad idea to add it when copper is already in?