In order to try and decide why some think there is a high percentage of disease/parasites now as compared to years past - I decided to check with several LFS and a couple large shippers - If you own an LFS - or have data concerning what copper (if any) your LFS (or wholesaler uses) Please answer. And Only 'Documented' - i.e. researched with the source - not assumptions... If you have talked to 3 LFS for example and they all use therapeutic copper in all their tanks - put that in the comments. Same for the other choices.