As I recall that's Seachem's "all in one" cure that suppose to be effective against ich, fungus, bacteria, etc . Its prime ingredients are a patented aldehyde as well as some malachite green. In short is the functional equivalent to other products on the market which are composed of formaldehyde and malachite green.
I don't think formaldehyde or malachite green are at the top of the list when it comes to ich treatments. I would stick with either hyposalinity or copper which have a consistent proven track record who's primary downside is that it requires QT (which you have already done).