Take your live rock out and inverts...put them into a QT system. You may, if you have 2, put the fish in one seperate and either copper or hypo them.
As for your main tank...putting copper in will ruin the tank. Unless you take everything out (substrate and all) and scrub the tank...copper will always be in there as it is its nature to bond with whatever it comes in contact with. Leave your tank fish and invert free for about 4-5 weeks, you can try the hyposalinity alot of these people on this board place so much trust in.
You could sterilize the tank as well. That consists of simply ridding the tank of all saltwater, sludge, etc...fill it with tap water right from the sink, and run the filters (minus carbon) for about 2-3 weeks. During this time, stir the substrate as well.
When you are finished...drain the tank, rinse it a few times (fill and drain) then fill it with your normal tank water supply. The tank will have to re-cycle...but, you will not have any saltwater organisms, good or bad, and a fresh start.
Keep your fish in QT for awhile, until the tank as re-cycled.
As for the fish from the get go...many here do not advocate it, but I use it and have 100 percent faith in it...freshwater dips. Dechlrorinated freshwater, proper temp, place fish in this water for about 2-3 minutes. Watch the fish closely, if the fish begins to show severe adverse reactions, remove it to saltwater quickly.
Freshwater dips accomplish in the same manner which hyposalinity does. Most marine organism die in freshwater due to the osmotic pressure differences of the freshwater. This includes all parasites.
Good luck...and remember, these are only my opinions and thoughts...methods of which I use myself...minus the hyposalinity stuff though.