Wait, thats right, youre the one with the thread about ich. I have no idea why you would introduce a new fish to a tank with ich.
There is only one way to get rid of it and its to treat the fish outside the main tank and leave the tank EMPTY for at least 6 weeks. It may seem to get better but it's gonna be lingering in there until it strikes again, and by then you might have more fish to expose.
You really need to get a handle on the ich before adding any more livestock.
Not trying to be mean at all, so sorry if it sounds that way. Just want you to have success and youre not co-operating LOL