I sort of disagree with just closing the case on a medicine for ich, I understand that many many medicines that claim to cure it have wound out being snake oils and unfortunately the nature of the decease and the corals is similar and it has been hard to find an specific cure but it is not impossible, it was not long ago that it was inconceivable to raise a hard corals but thanks like pioneers that tried and tried we now have the knowledge to reproduce them and sell them like candy in little jars at "Frag Swaps"
I remember the time that all my Xenia died overnight and i was able to figure out that it was the traces of fluke tabs in my fingers that has caused the extermination of a single coral in my tank, before that it was almost a pest that no one know how to get rid off.
We must continue to try new products it is the only way to get the solution to this old decease, I know that some of you are going to argue and even post links of 25 articles that contradict this but, like I said, it is not impossible!