There is NOTHING that can cure Ich and allow the corals and inverts to live. (PERIOD).
hyposalinity is the best method. When the hypo is done, the display tank if ready for fish again.
I tore down 185 pounds of LR
to get all my fish out a 125g tank to do a Hyposalinity treatment in a 30 gallon QT.
Read the articles that were linked about the life cycle of that parasite. Once it is in your tank the only way to eliminate it is to remove all fish for 6 - 8 weeks.
Here's the article on Hyposalinity