I will start off bt letting you know that I am new to this but I can give you some information since I am currently treating my main tank with Seacure a different type of copper). I also treated my main tank which had live sand. Copper kills live sand , live rock, inverterbrates and can be really sensitive to some fish. I think you should read up on Coopersafe. If that has copper in it, it probably ruined your live rock. If that product contains copper, you have to make sure you completely remove the copper from the tank before you add anything live and I wouldn't get anymore fish until you are back to normal in you tank. I have a quaratine tank right now housing my inverts until I can add them back to my display. What I plan on doing in the future is quaratining my sick fish or my new fish I get (before I put them in the display tank, to catch diseases early). This way I don't affect my display tank again. I'm also not treating with copper anymore. Ich cannot live in a tank when the salinity is 1.009. So you can drop your salinity in the tank , (depending on what you have in your tank fish, coral, zoos....) or you could put them in a quaratine tank and drop the salinity. I've read it's safer and less stressing on the fish. Copper is funny, it has to be kept in a theraputic range. If you don't have enough it won't treat your fishtank for the problem. If you add too much it could be toxic to them. I refuse to do copper again but that's my opinion. This ich thing has not been easy. Good Luck!