In my exp. I have treated ich with chems, heat and salt separetly. They all work if done right. The real key is length of treatment I have found. I would go two weeks with anything for ich. If I remember right you have mollies and other live bearers. They can handle a pretty high salt content I believe, so that may be the way to go. The fish you have more than anything should determine the treatmment you choose, IMO.