I have a 40b as my QT tank and I've done my 30 day treatment of coppersafe. Fish are looking great but now I want to remove all the copper from the tank and observe the fish for a few more weeks to ensure the copper isn't hiding anything. So far I've done 2 25% water changes, running GAC, added a Poly Fitler (which is turning blue) and running a skimmer. It's been about a week and my API test still shows copper in the system. Do I just need to be more patient and let the filtration do it's thing or is there anything else I should to to remove the copper?