I had ich in my tank a couple of months ago, and did the salt+heat treatment after trying meds, meds didn't work, but the salt+heat had it gone (invisible to the eye) in 3 days, it is said to continue the treatment for at least 3 days after visible spots are gone, or for 10 days regardless, which is what I did. I have heard , and found myself, that this method works more often and better than any meds you can buy. Good luck
oh, another thing, make sure you have good oxygenation in your tank because raising the temp lowers the o2 level, but Big Vine is right you've got to raise that temp to about 85