How often should I be water changing Qt/cupramine ?

[ReefKing101]

I Started QT 5 days ago for 2 small clowns in an 8g tank, added old filter floss from DT to job filter and I’ve been dozing Seachem Stability daily. Reached full cupramine dose yesterday. The ammonia alert badge hasn’t showed any ammonia whatsoever. Does this mean I don’t have to do a water change?

 

[ca1ore]

Only reason I ever do water changes on my fIsh QT is either in response to ammonia problems or in service of med removal.