I'm going thru a war with ich right now. About 2 weeks ago I did something I tell everyone else not to do, I bought a clown tang from the LFS and put it directly into my 180 gal SPS reef tank. A couple of days later I notice that is showing signs of ich. Next thing I know my powder blue tang and copperband are showing signs of ich. In a couple of days they were all covered with it and the same with the purple firefish. They showed no signs of fast breathing and were eating well.
I tried all different ways of catching them but they are way too smart and with 150 lbs of live rock for them to hide in, it was virtually impossible.
Last evening I decided the only way to save the fish was to remove about 75 pieces of coral and all 150 lbs of live rock. A friend of mine helped me. We finally caught the fish after the tank was emptied and put them in a QT tank. Worked all night and finally finished putting all the rock and coral back into the tank around 4 A.M. this morning.
I did not lose any coral in the process and the fish are in the QT tank and happily eating. I am treating with Copper Safe. I can already see a difference this morning. Most of the white spots have dropped off. I will keep the reef tank fishless for 8 weeks and the fish will stay in QT for the duration. This should rid the fish and tank of ich.
I do not ever want to go thru this again. I will follow my own advise from now on!!!

Rick