Well, I tell ya, I've battled ich with the best of them, and it is not fun. I hated it. So, because of my ordeal, I do treat new acquisitions in QT
with copper and here is why: many fish (especially hardy ones like clown fish and chromis) can be a carrier of ich and not show signs of it. Then, you stick them in your main, and boom....everybody gets ich. I know.....it happened to me! So for me, I'd rather lose a new acquistion in QT
from copper treatment (btw
, I never have) than to lose everyone in my main.