ok I put the carbon filter in which is what the copper treatment says to do to remove the copper. I understand that I will not take it all out but will lessen it. I will also do a water change everyday till the test kit reads 0. The LFS has copper in most of their tanks, one of which the puffers are in, so I am not to worried. I called and they use the same stuff I have. He said don't make it very strong and not for very long. So I will get him back to reg water soon. I don't want to do a big WC now because he just got in there and don't want the parm to change real fast. Hope this works let me know what you guys think. puffer is in a 20gal QT tank and I was going to go with a 1-2gal WC a day which would also help with the natrate build up I am sure to get.