I don't think this will be an issue but like to ask those of you with more knowledge before I do something I'm not 100% sure about. I have fish in QT undergoing copper treatment. I have started doing small daily water changes rather than weekly or sometimes bi weekly changes on my DT. On one of my tanks I change 4 gallons a day. QT has 25 gallons of water. Is there any reason I can not treat the 4 gallons removed with copper then do daily 4 gallon water changes on the QT to help with ammonia removal rather than dumping it down the drain. Figure it will save on salt and rodi.