I am also split on this.
I buy my fish from my LFS. I know he runs copper in the fish systems. I will always ask "how long have you had the fish", if it is less than three weeks, I pass. The fish isn't showing any signs of disease by then then it's probably fine. I might put it in a separate system for a week or two depending on the fish.
I buy my fish from my LFS. I know he runs copper in the fish systems. I will always ask "how long have you had the fish", if it is less than three weeks, I pass. The fish isn't showing any signs of disease by then then it's probably fine. I might put it in a separate system for a week or two depending on the fish.