Originally Posted by pat8you
What inverts are you moving back? Snail and hermits might be ok after a couple more water changes but i would not put them back in yet. Any copper in the water i think will kill them. Corals will not be able to go back into that tank. The copper gets and your rock and leeches out slowly. Even trace amounts will kill coral.
+1 for pat. Now that you've used copper in that tank, it's essentially useless for corals and inverts. As pat stated, once copper goes in, it soaks into the substrate,live rock, and any other porous material. I hate to be the bearer of bad news and I'm sorry your LFS
told you it was fine.