One thing which should be mentioned, because so far it hasn't been, is that there are several different types of "ich." These do NOT all respond to the same types of treatment, that is, there is no one single surefire way to get rid of whatever it is you're calling "ich."
Some kinds are copper tolerant. Some LAUGH at salt. Some like it hot.
If you don't have a microscope to absolutely identify the critter in question, then you may well have to try a couple of different things before you find what works.
Oh and the lifespan can be 23 days or more.
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