Rinsing OK for empty tank that had previous cupramine treatment?

[Bloodasp]

I agree fully with chin lee. Problems do occur that do need our attention but then sometimes just overreact for some simple thing which adds to the already high expense in the hobby "my hermit died now I must do a ton of water change" kinda extreme but that seems to be my view in some issues posted here. I love the hobby but I don't wanna turn it to my second job that i am not getting paid for. For me just keeping it simple and getting a ton of information before jumping into anything would be the best way of keeping all this paranoia and high expense down.