intense gravel vacuuming is essential when treating ich as the ich cysts fall into the gravel before they burst. I had ich once about 2 years ago and the salt and high temp worked after about 2 weeks of it. I am very glad to hear that you removed your plants, but a word of caution. If you put the plants in a bucket or empty tank or something, ich may very likely be on them. Ich cannot survive through a complete life cycle without a host, but at lower temps the cycle lasts much longer, so I would keep the plants in their other home significantly longer than the amount of time that you treat the tank. High temp speeds up the cycle, which is why we do that to treat it. Heat doesn't kill the ich, but if speeds up the time so that ich becomes vulnerable to the salt quicker.