I am about to dose all my fish in separate QT's after getting ich in my DT. The last fish I have yet to catch in my DT, as I was expecting is my royal gramma. I got it 10 years ago and it was already 2.5" or more then, so I'm guessing 11-12 years old. I am already moving my maroon clown pair/nems into another tank permanently since my flame angel fights with the big female and I plan to observe them since the don't show symptoms and medicate if needed as it will be much easier to catch them in the smaller DT. Was wondering if the gramma (no symptoms) would be better off in observation first with the clowns versus the copper treatment given his age? He could just live out life in the smaller system and never go back into the large DT.