To my knowledge, nothing has been confirmed to eradicate ich except copper and hypo salinity. You may be able to keep it under control with the off-the-shelf stuff, but if you want to be sure then go with one of these.
One of the benefits of a hospital tank is that you can do treatments that aren't safe for your display. You've done the hard part getting a tank set up- I would really start hyposalinity if you have the time.