A good artical about ich
http://www.cichlid-forum.com/articles/ich.php
I uses the tempreture and salt treatment for my fish including the loaches and it work. They can take salt just like the platies. Actually, they quite enjoy it. However, the smaller loach did not make it as the ich come and go for a week before I started the salt treatment. He is too weak to hang on for few more days. The only problem with salt and high tempreture is the plant doesn't like it.
If you want to use the medication, have a read at this post.
http://www.fishlore.com/Forum/3-freshwa ... ead.0.html