Treatment for ich can be done naturally and effectively using solely heat, there's an excellent article on this site about it, outlining why it works and is more effective than medicines in the long run. The takeaway is that if you have repeat bouts of ich, you need to be checking water quality, because stressed fish are more susceptible to disease and parasites and fungus. The increased heat is to prevent ich from reproducing. Being a parasite, it lives, dies and reproduces like fleas on a dog. Fortunately, you can raise the aquarium temperature high enough to prevent this. After the white spots disappear, you hold temperature high to let any remaining larvae die off in your substrate. That's the general idea of the treatment, but please seek out the article, I'm on my phone otherwise I'd link it here.
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