Quarantine tank

[LoneStar45]

One lesson I just learned from a bad shipment of fish from Saltwaterfish.com, is to never think you dont need a quarantine tank and turn it into a reef. These fish shipped in rancid water and although the ones that were still alive appeared ok, they developed "marine velvet" (amyloodinium ocellatum) which rapidly spread to my other fish. Of the 24 fish I had, 6 are still alive.
My question is this, Now that I learned the hard way that a quarantine tank is an absoulte necessity, and all my fish from now on will be quarantined for a month before added to my display, should I keep the copper treatment going and expose the new fish to copper regardless or should I change the water before they arrive and wait to see if anything develops?
If I change all the water, I run the nitrite/nitrate cycle again.
If I maintain the copper levels and introduce the new fish to it, do I harm the fish uneccessarily?
If removing the copper is the answer, can I just let the treatment fade out or do I do a full water change?

 

[Blown 346]

I myself leave my Q tank run 24/7 365. Then I dont have to worry about cycling it or have to keep tearing it down and setting it back up.
You could use the copper method but by doing so anything in that tank cannot be used in a reef. By using the coper treatment you wont hurt or harm the fish in any way as long as the concentration of the treatment is maintained at a safe level.

I would leave thetreatment going just incase you have a problem with anyfish in the main display again. Ich can show up from stress at anytime.
I would let the copper fade out on its own and of course with your normal scheduled water changes.