copper in my display tank

i have a 76 gallon that was set up 5 months ago, had a clown fish, canary blenny, royal gamma, that were quarantined for 80 days introduced about a month ago, and, at the same time, i moved a blue tang 7 years old from my 7 year old tank that had nothing introduced into it for 6 + years ( i am...

In the short time I've been in this hobby, there have been three categories for copper dosing as it relates to the DT. Yes, copper will kill corals and inverts, that is not debatable. Make no mistake. I do not intend to bash anyone who falls into any of the categories. My goal is to try to...