I lost about half of my fish to ick and I think I may have even had velvet also by not QTing a new fish
I was treating with NO ICK (should be called MORE ICH)
I was in the process of setting a couple of hospitol tanks to save what I had left when one of my yellow tang became covered with ich and fadeing fast the other tangs and angle also had it but not as bad
so in a panic I dumped in some ICH ATTACK this is stinky dark brown stuff It says on the bottle it wont discolor the water but it does a little
any way the next day the tang was doing better I continued the double the recommended treatment and the ich was completly gone in a week
I has been about 4 weeks now with no sign of ich
Every fish is now QTed efore it goes in the reef