What size QT, and how long will you be running your copper (presumably 30 days, followed by 2 weeks of additional observation)? The reason I ask is, most people use the smallest QT they can get away with, to save on water changes— which (other than fresh water evaporation top-offs), would have to be replaced with pre-medicated (i.e. proper strength copper) water. My point is, all things being equal, I just use a Seachem ammonia badge in a small-ish size QT and partially replace about 20% of the water before the ammonia builds up; maybe every 2-4 days, feeding lightly. I don’t really worry about removing the fish poop from the QT... why?... because the QT is not running in any beauty contest! (Lol)

Hope this helps. Others will chime in.