I'm probably going to go this route. However, I've read over and over again that we want to be leery of a used tank that was once treated with copper containing Ingredients I'm wondering if there's away to completely *clean* it. I mean, used tanks could be used three times over and have had god-knows-what in it. While I'm not real interested in taking short cuts that will ultimatly hurt my octopus. I do wonder- particularly because I will keep the tank properly filtered and maintained for the three months as suggested. - Would there really be any copper left after that? - If so, man, have I underestimated that little Mineral!